test mbuf pointers against NULL not 0

ok krw@ miod@

29 files changed, 101 insertions, 101 deletions

diff --git a/sys/arch/macppc/dev/if_bm.c b/sys/arch/macppc/dev/if_bm.c
index 0e290d226ec..45f4da2146a 100644
--- a/sys/arch/macppc/dev/if_bm.c
+++ b/sys/arch/macppc/dev/if_bm.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_bm.c,v 1.31 2015/02/09 03:09:57 dlg Exp $	*/
+/*	$OpenBSD: if_bm.c,v 1.32 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: if_bm.c,v 1.1 1999/01/01 01:27:52 tsubai Exp $	*/
 
 /*-
@@ -618,7 +618,7 @@ bmac_start(struct ifnet *ifp)
 			return;
 
 		IFQ_DEQUEUE(&ifp->if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			break;
 #if NBPFILTER > 0
 		/*
@@ -685,7 +685,7 @@ bmac_get(struct bmac_softc *sc, caddr_t pkt, int totlen)
 	int len;
 
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
-	if (m == 0)
+	if (m == NULL)
 		return (0);
 	m->m_pkthdr.len = totlen;
 	len = MHLEN;
@@ -695,7 +695,7 @@ bmac_get(struct bmac_softc *sc, caddr_t pkt, int totlen)
 	while (totlen > 0) {
 		if (top) {
 			MGET(m, M_DONTWAIT, MT_DATA);
-			if (m == 0) {
+			if (m == NULL) {
 				m_freem(top);
 				return (0);
 			}
diff --git a/sys/arch/vax/if/if_de.c b/sys/arch/vax/if/if_de.c
index 832e018025a..cc895ab8c8e 100644
--- a/sys/arch/vax/if/if_de.c
+++ b/sys/arch/vax/if/if_de.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_de.c,v 1.27 2015/02/01 15:27:11 miod Exp $	*/
+/*	$OpenBSD: if_de.c,v 1.28 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: if_de.c,v 1.27 1997/04/19 15:02:29 ragge Exp $	*/
 
 /*
@@ -352,7 +352,7 @@ destart(ifp)
 		return;
 	for (nxmit = ds->ds_nxmit; nxmit < NXMT; nxmit++) {
 		IF_DEQUEUE(&ds->ds_if.if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			break;
 		rp = &ds->ds_xrent[ds->ds_xfree];
 		if (rp->r_flags & XFLG_OWN)
diff --git a/sys/arch/vax/if/if_qe.c b/sys/arch/vax/if/if_qe.c
index 3033563c04c..fae242274a7 100644
--- a/sys/arch/vax/if/if_qe.c
+++ b/sys/arch/vax/if/if_qe.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_qe.c,v 1.31 2015/04/07 14:02:51 mpi Exp $	*/
+/*	$OpenBSD: if_qe.c,v 1.32 2015/05/13 10:42:46 jsg Exp $	*/
 /*      $NetBSD: if_qe.c,v 1.51 2002/06/08 12:28:37 ragge Exp $ */
 /*
  * Copyright (c) 1999 Ludd, University of Lule}, Sweden. All rights reserved.
@@ -440,7 +440,7 @@ qestart(struct ifnet *ifp)
 		}
 		idx = sc->sc_nexttx;
 		IFQ_POLL(&ifp->if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			goto out;
 		/*
 		 * Count number of mbufs in chain.
diff --git a/sys/arch/vax/if/sgec.c b/sys/arch/vax/if/sgec.c
index 22ce74a10b5..4c459bdee94 100644
--- a/sys/arch/vax/if/sgec.c
+++ b/sys/arch/vax/if/sgec.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sgec.c,v 1.27 2015/05/02 14:33:19 jsg Exp $	*/
+/*	$OpenBSD: sgec.c,v 1.28 2015/05/13 10:42:46 jsg Exp $	*/
 /*      $NetBSD: sgec.c,v 1.5 2000/06/04 02:14:14 matt Exp $ */
 /*
  * Copyright (c) 1999 Ludd, University of Lule}, Sweden. All rights reserved.
@@ -385,7 +385,7 @@ zestart(ifp)
 		}
 		idx = sc->sc_nexttx;
 		IF_DEQUEUE(&sc->sc_if.if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			goto out;
 		/*
 		 * Count number of mbufs in chain.
diff --git a/sys/dev/ic/am7990.c b/sys/dev/ic/am7990.c
index 2957d8ca6c6..8524336db79 100644
--- a/sys/dev/ic/am7990.c
+++ b/sys/dev/ic/am7990.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: am7990.c,v 1.50 2015/05/01 14:56:18 mpi Exp $	*/
+/*	$OpenBSD: am7990.c,v 1.51 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: am7990.c,v 1.74 2012/02/02 19:43:02 tls Exp $	*/
 
 /*-
@@ -485,7 +485,7 @@ am7990_start(struct ifnet *ifp)
 		}
 
 		IFQ_DEQUEUE(&ifp->if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			break;
 
 #if NBPFILTER > 0
diff --git a/sys/dev/ic/am79900.c b/sys/dev/ic/am79900.c
index feb473c6957..c0a624698f2 100644
--- a/sys/dev/ic/am79900.c
+++ b/sys/dev/ic/am79900.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: am79900.c,v 1.4 2015/05/01 14:56:18 mpi Exp $	*/
+/*	$OpenBSD: am79900.c,v 1.5 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: am79900.c,v 1.23 2012/02/02 19:43:02 tls Exp $	*/
 
 /*-
@@ -508,7 +508,7 @@ am79900_start(struct ifnet *ifp)
 		}
 
 		IFQ_DEQUEUE(&ifp->if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			break;
 
 #if NBPFILTER > 0
diff --git a/sys/dev/ic/dp8390.c b/sys/dev/ic/dp8390.c
index ded155a89c4..353f1ed3ef8 100644
--- a/sys/dev/ic/dp8390.c
+++ b/sys/dev/ic/dp8390.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dp8390.c,v 1.51 2015/04/30 20:55:23 mpi Exp $	*/
+/*	$OpenBSD: dp8390.c,v 1.52 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: dp8390.c,v 1.13 1998/07/05 06:49:11 jonathan Exp $	*/
 
 /*
@@ -440,7 +440,7 @@ outloop:
 		return;
 	}
 	IFQ_DEQUEUE(&ifp->if_snd, m0);
-	if (m0 == 0)
+	if (m0 == NULL)
 		return;
 
 	/* We need to use m->m_pkthdr.len, so require the header */
diff --git a/sys/dev/ic/i82596.c b/sys/dev/ic/i82596.c
index adf3c5b71a6..907ea78ecc3 100644
--- a/sys/dev/ic/i82596.c
+++ b/sys/dev/ic/i82596.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: i82596.c,v 1.41 2015/05/01 16:37:32 mpi Exp $	*/
+/*	$OpenBSD: i82596.c,v 1.42 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: i82586.c,v 1.18 1998/08/15 04:42:42 mycroft Exp $	*/
 
 /*-
@@ -982,7 +982,7 @@ i82596_get(struct ie_softc *sc, int head, int totlen)
 	resid = totlen;
 
 	MGETHDR(m0, M_DONTWAIT, MT_DATA);
-	if (m0 == 0)
+	if (m0 == NULL)
 		return (0);
 	m0->m_pkthdr.len = totlen;
 	len = MHLEN;
@@ -1013,7 +1013,7 @@ i82596_get(struct ie_softc *sc, int head, int totlen)
 		totlen -= len;
 		if (totlen > 0) {
 			MGET(newm, M_DONTWAIT, MT_DATA);
-			if (newm == 0)
+			if (newm == NULL)
 				goto bad;
 			len = MLEN;
 			m = m->m_next = newm;
@@ -1099,7 +1099,7 @@ i82596_readframe(sc, num)
 	m = i82596_get(sc, bstart, pktlen);
 	i82596_release_rbd_list(sc, bstart, bend);
 
-	if (m == 0) {
+	if (m == NULL) {
 		sc->sc_arpcom.ac_if.if_ierrors++;
 		return (0);
 	}
@@ -1231,7 +1231,7 @@ i82596_start(ifp)
 		}
 
 		IFQ_DEQUEUE(&ifp->if_snd, m0);
-		if (m0 == 0)
+		if (m0 == NULL)
 			break;
 
 		/* We need to use m->m_pkthdr.len, so require the header */
diff --git a/sys/dev/isa/if_eg.c b/sys/dev/isa/if_eg.c
index 4ebf30ca756..71e4fbea36d 100644
--- a/sys/dev/isa/if_eg.c
+++ b/sys/dev/isa/if_eg.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_eg.c,v 1.36 2014/12/22 02:28:51 tedu Exp $	*/
+/*	$OpenBSD: if_eg.c,v 1.37 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: if_eg.c,v 1.26 1996/05/12 23:52:27 mycroft Exp $	*/
 
 /*
@@ -521,7 +521,7 @@ egstart(struct ifnet *ifp)
 loop:
 	/* Dequeue the next datagram. */
 	IFQ_DEQUEUE(&ifp->if_snd, m0);
-	if (m0 == 0)
+	if (m0 == NULL)
 		return;
 	
 	ifp->if_flags |= IFF_OACTIVE;
@@ -682,7 +682,7 @@ egread(struct eg_softc *sc, caddr_t buf, int len)
 
 	/* Pull packet off interface. */
 	m = egget(sc, buf, len);
-	if (m == 0) {
+	if (m == NULL) {
 		ifp->if_ierrors++;
 		return;
 	}
@@ -712,7 +712,7 @@ egget(struct eg_softc *sc, caddr_t buf, int totlen)
 	int len;
 
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
-	if (m == 0)
+	if (m == NULL)
 		return (0);
 	m->m_pkthdr.rcvif = ifp;
 	m->m_pkthdr.len = totlen;
@@ -723,7 +723,7 @@ egget(struct eg_softc *sc, caddr_t buf, int totlen)
 	while (totlen > 0) {
 		if (top) {
 			MGET(m, M_DONTWAIT, MT_DATA);
-			if (m == 0) {
+			if (m == NULL) {
 				m_freem(top);
 				return (0);
 			}
diff --git a/sys/dev/isa/if_el.c b/sys/dev/isa/if_el.c
index 66315aa02b6..ac2d81dad2c 100644
--- a/sys/dev/isa/if_el.c
+++ b/sys/dev/isa/if_el.c
@@ -1,4 +1,4 @@
-/*    $OpenBSD: if_el.c,v 1.24 2014/12/22 02:28:51 tedu Exp $       */
+/*    $OpenBSD: if_el.c,v 1.25 2015/05/13 10:42:46 jsg Exp $       */
 /*	$NetBSD: if_el.c,v 1.39 1996/05/12 23:52:32 mycroft Exp $	*/
 
 /*
@@ -314,7 +314,7 @@ elstart(ifp)
 		IFQ_DEQUEUE(&ifp->if_snd, m0);
 
 		/* If there's nothing to send, return. */
-		if (m0 == 0)
+		if (m0 == NULL)
 			break;
 
 #if NBPFILTER > 0
@@ -502,7 +502,7 @@ elread(sc, len)
 
 	/* Pull packet off interface. */
 	m = elget(sc, len);
-	if (m == 0) {
+	if (m == NULL) {
 		ifp->if_ierrors++;
 		return;
 	}
@@ -537,7 +537,7 @@ elget(sc, totlen)
 	int len;
 
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
-	if (m == 0)
+	if (m == NULL)
 		return 0;
 	m->m_pkthdr.rcvif = ifp;
 	m->m_pkthdr.len = totlen;
@@ -551,7 +551,7 @@ elget(sc, totlen)
 	while (totlen > 0) {
 		if (top) {
 			MGET(m, M_DONTWAIT, MT_DATA);
-			if (m == 0) {
+			if (m == NULL) {
 				m_freem(top);
 				return 0;
 			}
diff --git a/sys/dev/isa/if_ie.c b/sys/dev/isa/if_ie.c
index d15ead7ca13..2c2b1cf0d7d 100644
--- a/sys/dev/isa/if_ie.c
+++ b/sys/dev/isa/if_ie.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ie.c,v 1.40 2014/12/22 02:28:51 tedu Exp $	*/
+/*	$OpenBSD: if_ie.c,v 1.41 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: if_ie.c,v 1.51 1996/05/12 23:52:48 mycroft Exp $	*/
 
 /*-
@@ -1258,7 +1258,7 @@ ieget(sc, ehp, to_bpf)
 	}
 
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
-	if (m == 0)
+	if (m == NULL)
 		return 0;
 	m->m_pkthdr.rcvif = &sc->sc_arpcom.ac_if;
 	m->m_pkthdr.len = totlen;
@@ -1273,7 +1273,7 @@ ieget(sc, ehp, to_bpf)
 	while (totlen > 0) {
 		if (top) {
 			MGET(m, M_DONTWAIT, MT_DATA);
-			if (m == 0) {
+			if (m == NULL) {
 				m_freem(top);
 				return 0;
 			}
@@ -1344,7 +1344,7 @@ ie_readframe(sc, num)
 	int num;			/* frame number to read */
 {
 	int status;
-	struct mbuf *m = 0;
+	struct mbuf *m = NULL;
 	struct ether_header eh;
 #if NBPFILTER > 0
 	int bpf_gets_it = 0;
@@ -1367,7 +1367,7 @@ ie_readframe(sc, num)
 #endif
 		ie_drop_packet_buffer(sc);
 	}
-	if (m == 0) {
+	if (m == NULL) {
 		sc->sc_arpcom.ac_if.if_ierrors++;
 		return;
 	}
@@ -1465,7 +1465,7 @@ iestart(ifp)
 		}
 
 		IFQ_DEQUEUE(&ifp->if_snd, m0);
-		if (m0 == 0)
+		if (m0 == NULL)
 			break;
 
 		/* We need to use m->m_pkthdr.len, so require the header */
diff --git a/sys/dev/pcmcia/if_cnw.c b/sys/dev/pcmcia/if_cnw.c
index 0f6019103b9..ffdb6712cb9 100644
--- a/sys/dev/pcmcia/if_cnw.c
+++ b/sys/dev/pcmcia/if_cnw.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_cnw.c,v 1.27 2015/03/14 03:38:49 jsg Exp $	*/
+/*	$OpenBSD: if_cnw.c,v 1.28 2015/05/13 10:42:46 jsg Exp $	*/
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -462,7 +462,7 @@ cnw_start(ifp)
 		}
 
 		IFQ_DEQUEUE(&ifp->if_snd, m0);
-		if (m0 == 0)
+		if (m0 == NULL)
 			return;
 
 #if NBPFILTER > 0
@@ -557,7 +557,7 @@ cnw_read(sc)
 	bufptr = 0; /* XXX make gcc happy */
 
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
-	if (m == 0)
+	if (m == NULL)
 		return (0);
 	m->m_pkthdr.rcvif = &sc->sc_arpcom.ac_if;
 	m->m_pkthdr.len = totbytes;
@@ -568,7 +568,7 @@ cnw_read(sc)
 	while (totbytes > 0) {
 		if (top) {
 			MGET(m, M_DONTWAIT, MT_DATA);
-			if (m == 0) {
+			if (m == NULL) {
 				m_freem(top);
 				return (0);
 			}
@@ -649,7 +649,7 @@ cnw_recv(sc)
 		CNW_CMD0(sc, CNW_CMD_SRP);
 
 		/* Did we manage to get the packet from the interface? */
-		if (m == 0) {
+		if (m == NULL) {
 			++ifp->if_ierrors;
 			return;
 		}
diff --git a/sys/dev/pcmcia/if_xe.c b/sys/dev/pcmcia/if_xe.c
index d07b7398e7a..c98bff5c62b 100644
--- a/sys/dev/pcmcia/if_xe.c
+++ b/sys/dev/pcmcia/if_xe.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_xe.c,v 1.47 2015/03/14 03:38:49 jsg Exp $	*/
+/*	$OpenBSD: if_xe.c,v 1.48 2015/05/13 10:42:46 jsg Exp $	*/
 
 /*
  * Copyright (c) 1999 Niklas Hallqvist, Brandon Creighton, Job de Haas
@@ -771,7 +771,7 @@ xe_get(sc)
 	recvcount += pktlen;
 
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
-	if (m == 0)
+	if (m == NULL)
 		return (recvcount);
 	m->m_pkthdr.rcvif = ifp;
 	m->m_pkthdr.len = pktlen;
@@ -782,7 +782,7 @@ xe_get(sc)
 	while (pktlen > 0) {
 		if (top) {
 			MGET(m, M_DONTWAIT, MT_DATA);
-			if (m == 0) {
+			if (m == NULL) {
 				m_freem(top);
 				return (recvcount);
 			}
@@ -1097,7 +1097,7 @@ xe_start(ifp)
 
 	/* Peek at the next packet. */
 	IFQ_POLL(&ifp->if_snd, m0);
-	if (m0 == 0)
+	if (m0 == NULL)
 		return;
 
 	/* We need to use m->m_pkthdr.len, so require the header. */
diff --git a/sys/dev/sbus/be.c b/sys/dev/sbus/be.c
index 3beb83baf55..04fae5de770 100644
--- a/sys/dev/sbus/be.c
+++ b/sys/dev/sbus/be.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: be.c,v 1.29 2015/04/07 14:59:06 mpi Exp $	*/
+/*	$OpenBSD: be.c,v 1.30 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: be.c,v 1.26 2001/03/20 15:39:20 pk Exp $	*/
 
 /*-
@@ -580,7 +580,7 @@ bestart(struct ifnet *ifp)
 
 	for (;;) {
 		IFQ_DEQUEUE(&ifp->if_snd, m);
-		if (m == 0)
+		if (m == NULL)
 			break;
 
 #if NBPFILTER > 0
diff --git a/sys/kern/sys_socket.c b/sys/kern/sys_socket.c
index df1c92719b2..6272c3458e6 100644
--- a/sys/kern/sys_socket.c
+++ b/sys/kern/sys_socket.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sys_socket.c,v 1.19 2014/07/13 15:52:38 tedu Exp $	*/
+/*	$OpenBSD: sys_socket.c,v 1.20 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $	*/
 
 /*
@@ -57,8 +57,8 @@ int
 soo_read(struct file *fp, off_t *poff, struct uio *uio, struct ucred *cred)
 {
 
-	return (soreceive((struct socket *)fp->f_data, (struct mbuf **)0,
-		uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0,
+	return (soreceive((struct socket *)fp->f_data, (struct mbuf **)NULL,
+		uio, (struct mbuf **)NULL, (struct mbuf **)NULL, (int *)NULL,
 		(socklen_t)0));
 }
 
@@ -67,8 +67,8 @@ int
 soo_write(struct file *fp, off_t *poff, struct uio *uio, struct ucred *cred)
 {
 
-	return (sosend((struct socket *)fp->f_data, (struct mbuf *)0,
-		uio, (struct mbuf *)0, (struct mbuf *)0, 0));
+	return (sosend((struct socket *)fp->f_data, (struct mbuf *)NULL,
+		uio, (struct mbuf *)NULL, (struct mbuf *)NULL, 0));
 }
 
 int
@@ -125,7 +125,7 @@ soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p)
 	if (IOCGROUP(cmd) == 'r')
 		return (rtioctl(cmd, data, p));
 	return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 
-	    (struct mbuf *)cmd, (struct mbuf *)data, (struct mbuf *)0, p));
+	    (struct mbuf *)cmd, (struct mbuf *)data, (struct mbuf *)NULL, p));
 }
 
 int
diff --git a/sys/net/bpf.c b/sys/net/bpf.c
index f76c855a8e1..5626c73fef0 100644
--- a/sys/net/bpf.c
+++ b/sys/net/bpf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bpf.c,v 1.118 2015/02/10 21:56:10 miod Exp $	*/
+/*	$OpenBSD: bpf.c,v 1.119 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: bpf.c,v 1.33 1997/02/21 23:59:35 thorpej Exp $	*/
 
 /*
@@ -1157,7 +1157,7 @@ bpf_mcopy(const void *src_arg, void *dst_arg, size_t len)
 	m = src_arg;
 	dst = dst_arg;
 	while (len > 0) {
-		if (m == 0)
+		if (m == NULL)
 			panic("bpf_mcopy");
 		count = min(m->m_len, len);
 		bcopy(mtod(m, caddr_t), (caddr_t)dst, count);
diff --git a/sys/net/bpf_filter.c b/sys/net/bpf_filter.c
index 755e4a5a794..93da2943e05 100644
--- a/sys/net/bpf_filter.c
+++ b/sys/net/bpf_filter.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bpf_filter.c,v 1.26 2014/09/19 11:43:31 otto Exp $	*/
+/*	$OpenBSD: bpf_filter.c,v 1.27 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: bpf_filter.c,v 1.12 1996/02/13 22:00:00 christos Exp $	*/
 
 /*
@@ -76,7 +76,7 @@
 	while (k >= len) { \
 		k -= len; \
 		m = m->m_next; \
-		if (m == 0) \
+		if (m == NULL) \
 			return 0; \
 		len = m->m_len; \
 	} \
@@ -102,7 +102,7 @@ bpf_m_xword(struct mbuf *m, u_int32_t k, int *err)
 		return EXTRACT_LONG(cp);
 	}
 	m0 = m->m_next;
-	if (m0 == 0 || m0->m_len + len - k < 4)
+	if (m0 == NULL || m0->m_len + len - k < 4)
 		return 0;
 	*err = 0;
 	np = mtod(m0, u_char *);
@@ -134,7 +134,7 @@ bpf_m_xhalf(struct mbuf *m, u_int32_t k, int *err)
 		return EXTRACT_SHORT(cp);
 	}
 	m0 = m->m_next;
-	if (m0 == 0)
+	if (m0 == NULL)
 		return 0;
 	*err = 0;
 	return (cp[0] << 8) | mtod(m0, u_char *)[0];
diff --git a/sys/net/if_ppp.c b/sys/net/if_ppp.c
index e924037f9c9..f991c8d71fe 100644
--- a/sys/net/if_ppp.c
+++ b/sys/net/if_ppp.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ppp.c,v 1.82 2015/04/10 13:58:20 dlg Exp $	*/
+/*	$OpenBSD: if_ppp.c,v 1.83 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: if_ppp.c,v 1.39 1997/05/17 21:11:59 christos Exp $	*/
 
 /*
@@ -736,7 +736,7 @@ pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
      * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
      */
     M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT);
-    if (m0 == 0) {
+    if (m0 == NULL) {
 	error = ENOBUFS;
 	goto bad;
     }
diff --git a/sys/net/raw_usrreq.c b/sys/net/raw_usrreq.c
index 048da3b7c3f..6f8f7a11bb2 100644
--- a/sys/net/raw_usrreq.c
+++ b/sys/net/raw_usrreq.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: raw_usrreq.c,v 1.18 2015/03/14 03:38:51 jsg Exp $	*/
+/*	$OpenBSD: raw_usrreq.c,v 1.19 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: raw_usrreq.c,v 1.11 1996/02/13 22:00:43 christos Exp $	*/
 
 /*
@@ -108,7 +108,7 @@ raw_input(struct mbuf *m0, ...)
 			struct mbuf *n;
 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
 				if (sbappendaddr(&last->so_rcv, src,
-				    n, (struct mbuf *)0) == 0)
+				    n, (struct mbuf *)NULL) == 0)
 					/* should notify about lost packet */
 					m_freem(n);
 				else {
@@ -121,7 +121,7 @@ raw_input(struct mbuf *m0, ...)
 	}
 	if (last) {
 		if (sbappendaddr(&last->so_rcv, src,
-		    m, (struct mbuf *)0) == 0)
+		    m, (struct mbuf *)NULL) == 0)
 			m_freem(m);
 		else {
 			sorwakeup(last);
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index c46de81c5a3..eb221a75b6b 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtsock.c,v 1.158 2015/05/05 09:41:43 mpi Exp $	*/
+/*	$OpenBSD: rtsock.c,v 1.159 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: rtsock.c,v 1.18 1996/03/29 00:32:10 cgd Exp $	*/
 
 /*
@@ -304,7 +304,7 @@ rt_senddesync(void *data)
 		desync_mbuf = rt_msg1(RTM_DESYNC, NULL);
 		if ((desync_mbuf != NULL) && 
 		    (sbappendaddr(&rp->rcb_socket->so_rcv, &route_src, 
-		    desync_mbuf, (struct mbuf *)0) != 0)) {
+		    desync_mbuf, (struct mbuf *)NULL) != 0)) {
 			rop->flags &= ~ROUTECB_FLAG_DESYNC;
 			sorwakeup(rp->rcb_socket);
 		} else {
@@ -405,7 +405,7 @@ route_input(struct mbuf *m0, ...)
 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
 				if (sbspace(&last->so_rcv) < (2 * MSIZE) ||
 				    sbappendaddr(&last->so_rcv, sosrc,
-				    n, (struct mbuf *)0) == 0) {
+				    n, (struct mbuf *)NULL) == 0) {
 					/*
 					 * Flag socket as desync'ed and 
 					 * flush required
@@ -426,7 +426,7 @@ route_input(struct mbuf *m0, ...)
 	if (last) {
 		if (sbspace(&last->so_rcv) < (2 * MSIZE) ||
 		    sbappendaddr(&last->so_rcv, sosrc,
-		    m, (struct mbuf *)0) == 0) {
+		    m, (struct mbuf *)NULL) == 0) {
 			/* Flag socket as desync'ed and flush required */
 			sotoroutecb(last)->flags |= 
 			    ROUTECB_FLAG_DESYNC | ROUTECB_FLAG_FLUSH;
@@ -468,7 +468,7 @@ route_output(struct mbuf *m, ...)
 	va_end(ap);
 
 	info.rti_info[RTAX_DST] = NULL;	/* for error handling (goto flush) */
-	if (m == 0 || ((m->m_len < sizeof(int32_t)) &&
+	if (m == NULL || ((m->m_len < sizeof(int32_t)) &&
 	    (m = m_pullup(m, sizeof(int32_t))) == 0))
 		return (ENOBUFS);
 	if ((m->m_flags & M_PKTHDR) == 0)
@@ -978,7 +978,7 @@ rt_msg1(int type, struct rt_addrinfo *rtinfo)
 			m = NULL;
 		}
 	}
-	if (m == 0)
+	if (m == NULL)
 		return (m);
 	m->m_pkthdr.len = m->m_len = hlen = len;
 	m->m_pkthdr.rcvif = NULL;
@@ -1092,7 +1092,7 @@ rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags,
 	if (route_cb.any_count == 0)
 		return;
 	m = rt_msg1(type, rtinfo);
-	if (m == 0)
+	if (m == NULL)
 		return;
 	rtm = mtod(m, struct rt_msghdr *);
 	rtm->rtm_flags = RTF_DONE | flags;
@@ -1121,7 +1121,7 @@ rt_ifmsg(struct ifnet *ifp)
 	if (route_cb.any_count == 0)
 		return;
 	m = rt_msg1(RTM_IFINFO, NULL);
-	if (m == 0)
+	if (m == NULL)
 		return;
 	ifm = mtod(m, struct if_msghdr *);
 	ifm->ifm_index = ifp->if_index;
@@ -1188,7 +1188,7 @@ rt_ifannouncemsg(struct ifnet *ifp, int what)
 	if (route_cb.any_count == 0)
 		return;
 	m = rt_msg1(RTM_IFANNOUNCE, NULL);
-	if (m == 0)
+	if (m == NULL)
 		return;
 	ifan = mtod(m, struct if_announcemsghdr *);
 	ifan->ifan_index = ifp->if_index;
diff --git a/sys/netinet/ip_icmp.c b/sys/netinet/ip_icmp.c
index 82774bd7905..6a795012c77 100644
--- a/sys/netinet/ip_icmp.c
+++ b/sys/netinet/ip_icmp.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_icmp.c,v 1.132 2015/02/05 03:01:03 mpi Exp $	*/
+/*	$OpenBSD: ip_icmp.c,v 1.133 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: ip_icmp.c,v 1.19 1996/02/13 23:42:22 christos Exp $	*/
 
 /*
@@ -687,7 +687,7 @@ int
 icmp_reflect(struct mbuf *m, struct mbuf **op, struct in_ifaddr *ia)
 {
 	struct ip *ip = mtod(m, struct ip *);
-	struct mbuf *opts = 0;
+	struct mbuf *opts = NULL;
 	struct sockaddr_in sin;
 	struct rtentry *rt;
 	int optlen = (ip->ip_hl << 2) - sizeof(struct ip);
diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index 38b140395ab..967c8ddaedb 100644
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_input.c,v 1.248 2015/04/10 13:58:20 dlg Exp $	*/
+/*	$OpenBSD: ip_input.c,v 1.249 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: ip_input.c,v 1.30 1996/03/16 23:53:58 christos Exp $	*/
 
 /*
@@ -550,7 +550,7 @@ found:
 			ipqe->ipqe_m = m;
 			ipqe->ipqe_ip = ip;
 			m = ip_reass(ipqe, fp);
-			if (m == 0) {
+			if (m == NULL) {
 				return;
 			}
 			ipstat.ips_reassembled++;
diff --git a/sys/netinet/ip_ipip.c b/sys/netinet/ip_ipip.c
index 7f104257f66..77756748da2 100644
--- a/sys/netinet/ip_ipip.c
+++ b/sys/netinet/ip_ipip.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_ipip.c,v 1.58 2015/04/14 14:20:01 mikeb Exp $ */
+/*	$OpenBSD: ip_ipip.c,v 1.59 2015/05/13 10:42:46 jsg Exp $ */
 /*
  * The authors of this code are John Ioannidis (ji@tla.org),
  * Angelos D. Keromytis (kermit@csd.uch.gr) and
@@ -418,7 +418,7 @@ ipip_output(struct mbuf *m, struct tdb *tdb, struct mbuf **mp, int dummy,
 		}
 
 		M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
-		if (m == 0) {
+		if (m == NULL) {
 			DPRINTF(("ipip_output(): M_PREPEND failed\n"));
 			ipipstat.ipips_hdrops++;
 			*mp = NULL;
@@ -514,7 +514,7 @@ ipip_output(struct mbuf *m, struct tdb *tdb, struct mbuf **mp, int dummy,
 		}
 
 		M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
-		if (m == 0) {
+		if (m == NULL) {
 			DPRINTF(("ipip_output(): M_PREPEND failed\n"));
 			ipipstat.ipips_hdrops++;
 			*mp = NULL;
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c
index 92a45e5bcc8..4ec5b23e667 100644
--- a/sys/netinet/ip_output.c
+++ b/sys/netinet/ip_output.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_output.c,v 1.279 2015/04/17 11:04:01 mikeb Exp $	*/
+/*	$OpenBSD: ip_output.c,v 1.280 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: ip_output.c,v 1.28 1996/02/13 23:43:07 christos Exp $	*/
 
 /*
@@ -750,7 +750,7 @@ ip_fragment(struct mbuf *m, struct ifnet *ifp, u_long mtu)
 	mhlen = sizeof (struct ip);
 	for (off = hlen + len; off < ntohs(ip->ip_len); off += len) {
 		MGETHDR(m, M_DONTWAIT, MT_HEADER);
-		if (m == 0) {
+		if (m == NULL) {
 			ipstat.ips_odropped++;
 			error = ENOBUFS;
 			goto sendorfree;
@@ -848,7 +848,7 @@ ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen)
 		ip->ip_dst = p->ipopt_dst;
 	if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
 		MGETHDR(n, M_DONTWAIT, MT_HEADER);
-		if (n == 0)
+		if (n == NULL)
 			return (m);
 		M_MOVE_HDR(n, m);
 		n->m_pkthdr.len += optlen;
@@ -1022,7 +1022,7 @@ ip_ctloutput(int op, struct socket *so, int level, int optname,
 			break;
 
 		case IP_PORTRANGE:
-			if (m == 0 || m->m_len != sizeof(int))
+			if (m == NULL || m->m_len != sizeof(int))
 				error = EINVAL;
 			else {
 				optval = *mtod(m, int *);
@@ -1058,7 +1058,7 @@ ip_ctloutput(int op, struct socket *so, int level, int optname,
 #ifndef IPSEC
 			error = EOPNOTSUPP;
 #else
-			if (m == 0 || m->m_len != sizeof(int)) {
+			if (m == NULL || m->m_len != sizeof(int)) {
 				error = EINVAL;
 				break;
 			}
@@ -1310,7 +1310,7 @@ ip_pcbopts(struct mbuf **pcbopt, struct mbuf *m)
 	if (*pcbopt)
 		(void)m_free(*pcbopt);
 	*pcbopt = 0;
-	if (m == (struct mbuf *)0 || m->m_len == 0) {
+	if (m == (struct mbuf *)NULL || m->m_len == 0) {
 		/*
 		 * Only turning off any previous options.
 		 */
diff --git a/sys/netinet/ipsec_input.c b/sys/netinet/ipsec_input.c
index cd1bfcfb320..7ecab1e41d4 100644
--- a/sys/netinet/ipsec_input.c
+++ b/sys/netinet/ipsec_input.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ipsec_input.c,v 1.130 2015/04/17 11:04:02 mikeb Exp $	*/
+/*	$OpenBSD: ipsec_input.c,v 1.131 2015/05/13 10:42:46 jsg Exp $	*/
 /*
  * The authors of this code are John Ioannidis (ji@tla.org),
  * Angelos D. Keromytis (kermit@csd.uch.gr) and
@@ -132,7 +132,7 @@ ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto,
 	IPSEC_ISTAT(espstat.esps_input, ahstat.ahs_input,
 	    ipcompstat.ipcomps_input);
 
-	if (m == 0) {
+	if (m == NULL) {
 		DPRINTF(("ipsec_common_input(): NULL packet received\n"));
 		IPSEC_ISTAT(espstat.esps_hdrops, ahstat.ahs_hdrops,
 		    ipcompstat.ipcomps_hdrops);
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index 04a32d0cbcf..9e9ba4f1a91 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tcp_input.c,v 1.289 2015/04/16 19:24:13 markus Exp $	*/
+/*	$OpenBSD: tcp_input.c,v 1.290 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: tcp_input.c,v 1.23 1996/02/13 23:43:44 christos Exp $	*/
 
 /*
@@ -2850,7 +2850,7 @@ tcp_pulloutofband(struct socket *so, u_int urgent, struct mbuf *m, int off)
 		}
 		cnt -= m->m_len;
 		m = m->m_next;
-		if (m == 0)
+		if (m == NULL)
 			break;
 	}
 	panic("tcp_pulloutofband");
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
index b98ecd29cba..3637eefcadb 100644
--- a/sys/netinet/tcp_subr.c
+++ b/sys/netinet/tcp_subr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tcp_subr.c,v 1.141 2015/05/07 09:19:31 mikeb Exp $	*/
+/*	$OpenBSD: tcp_subr.c,v 1.142 2015/05/13 10:42:46 jsg Exp $	*/
 /*	$NetBSD: tcp_subr.c,v 1.22 1996/02/13 23:44:00 christos Exp $	*/
 
 /*
@@ -303,8 +303,8 @@ tcp_respond(struct tcpcb *tp, caddr_t template, struct tcphdr *th0,
 {
 	int tlen;
 	int win = 0;
-	struct mbuf *m = 0;
-	struct route *ro = 0;
+	struct mbuf *m = NULL;
+	struct route *ro = NULL;
 	struct tcphdr *th;
 	struct ip *ip;
 #ifdef INET6
diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c
index 3b8ec6a1269..a9a4258a714 100644
--- a/sys/netinet6/ip6_output.c
+++ b/sys/netinet6/ip6_output.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip6_output.c,v 1.170 2015/04/17 11:04:02 mikeb Exp $	*/
+/*	$OpenBSD: ip6_output.c,v 1.171 2015/05/13 10:42:47 jsg Exp $	*/
 /*	$KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $	*/
 
 /*
@@ -1056,7 +1056,7 @@ ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
 	 */
 	if (exthdrs->ip6e_hbh == 0) {
 		MGET(mopt, M_DONTWAIT, MT_DATA);
-		if (mopt == 0)
+		if (mopt == NULL)
 			return (ENOBUFS);
 		mopt->m_len = JUMBOOPTLEN;
 		optbuf = mtod(mopt, u_int8_t *);
@@ -1165,7 +1165,7 @@ ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
 		struct mbuf *mfrg;
 
 		MGET(mfrg, M_DONTWAIT, MT_DATA);
-		if (mfrg == 0)
+		if (mfrg == NULL)
 			return (ENOBUFS);
 		mfrg->m_len = sizeof(struct ip6_frag);
 		*frghdrp = mtod(mfrg, struct ip6_frag *);
@@ -1602,7 +1602,7 @@ do { \
 #ifndef IPSEC
 				error = EINVAL;
 #else
-				if (m == 0 || m->m_len != sizeof(int)) {
+				if (m == NULL || m->m_len != sizeof(int)) {
 					error = EINVAL;
 					break;
 				}
@@ -3106,7 +3106,7 @@ ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
 	ip6 = mtod(m, struct ip6_hdr *);
 	if (m->m_len > sizeof(*ip6)) {
 		MGETHDR(mh, M_DONTWAIT, MT_HEADER);
-		if (mh == 0) {
+		if (mh == NULL) {
 			m_freem(m);
 			return ENOBUFS;
 		}
diff --git a/sys/netinet6/udp6_output.c b/sys/netinet6/udp6_output.c
index 686c0391625..874d3088f1b 100644
--- a/sys/netinet6/udp6_output.c
+++ b/sys/netinet6/udp6_output.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: udp6_output.c,v 1.33 2014/12/05 15:50:04 mpi Exp $	*/
+/*	$OpenBSD: udp6_output.c,v 1.34 2015/05/13 10:42:47 jsg Exp $	*/
 /*	$KAME: udp6_output.c,v 1.21 2001/02/07 11:51:54 itojun Exp $	*/
 
 /*
@@ -182,7 +182,7 @@ udp6_output(struct inpcb *in6p, struct mbuf *m, struct mbuf *addr6,
 	 * for UDP and IP6 headers.
 	 */
 	M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
-	if (m == 0) {
+	if (m == NULL) {
 		error = ENOBUFS;
 		goto releaseopt;
 	}