From 53be5ecb9959921ecc47ae107f13af875f61ca42 Mon Sep 17 00:00:00 2001
From: Philip Guenthe <guenther@cvs.openbsd.org>
Date: Wed, 11 Jul 2012 23:07:20 +0000
Subject: Revert the blocked FIFO open fix, as there's either a race in the
 ref-count handling under handling, or blambert@ is messing with my head

---
 sys/kern/vfs_syscalls.c | 42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

(limited to 'sys/kern/vfs_syscalls.c')

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index c6462898d5e..b8ccd2b94d6 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vfs_syscalls.c,v 1.186 2012/07/10 17:00:55 guenther Exp $	*/
+/*	$OpenBSD: vfs_syscalls.c,v 1.187 2012/07/11 23:07:19 guenther Exp $	*/
 /*	$NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $	*/
 
 /*
@@ -856,14 +856,12 @@ doopenat(struct proc *p, int fd, const char *path, int oflags, mode_t mode,
 	struct nameidata nd;
 
 	fdplock(fdp);
-	if ((error = falloc(p, &fp, &indx)) != 0) {
-		fdpunlock(fdp);
-		return (error);
-	}
+
+	if ((error = falloc(p, &fp, &indx)) != 0)
+		goto out;
 	flags = FFLAGS(oflags);
 	if (flags & O_CLOEXEC)
 		fdp->fd_ofileflags[indx] |= UF_EXCLOSE;
-	fdpunlock(fdp);
 
 	cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
 	NDINITAT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fd, path, p);
@@ -873,16 +871,19 @@ doopenat(struct proc *p, int fd, const char *path, int oflags, mode_t mode,
 		flags &= ~O_TRUNC;	/* Must do truncate ourselves */
 	}
 	if ((error = vn_open(&nd, flags, cmode)) != 0) {
-		fdplock(fdp);
 		if (error == ENODEV &&
 		    p->p_dupfd >= 0 &&			/* XXX from fdopen */
-		    (error = dupfdopen(p, indx, fp, flags)) == 0) {
+		    (error =
+			dupfdopen(fdp, indx, p->p_dupfd, flags)) == 0) {
+			closef(fp, p);
 			*retval = indx;
 			goto out;
 		}
 		if (error == ERESTART)
 			error = EINTR;
-		goto err;
+		fdremove(fdp, indx);
+		closef(fp, p);
+		goto out;
 	}
 	p->p_dupfd = 0;
 	vp = nd.ni_vp;
@@ -904,9 +905,10 @@ doopenat(struct proc *p, int fd, const char *path, int oflags, mode_t mode,
 		VOP_UNLOCK(vp, 0, p);
 		error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
 		if (error) {
-			/* FRELE will vn_close the file for us. */
-			fdplock(fdp);
-			goto err;
+			/* closef will vn_close the file for us. */
+			fdremove(fdp, indx);
+			closef(fp, p);
+			goto out;
 		}
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
 		fp->f_flag |= FHASLOCK;
@@ -925,25 +927,17 @@ doopenat(struct proc *p, int fd, const char *path, int oflags, mode_t mode,
 		}
 		if (error) {
 			VOP_UNLOCK(vp, 0, p);
-			/* FRELE will close the file for us. */
-			fdplock(fdp);
-			goto err;
+			/* closef will close the file for us. */
+			fdremove(fdp, indx);
+			closef(fp, p);
+			goto out;
 		}
 	}
 	VOP_UNLOCK(vp, 0, p);
 	*retval = indx;
 	FILE_SET_MATURE(fp, p);
-	return (0);
-
-err:
-	/* only remove the fd if the file didn't change behind out back */
-	if (fdp->fd_ofiles[indx] == fp) {
-		fdremove(fdp, indx);
-		FRELE(fp, p);
-	}
 out:
 	fdpunlock(fdp);
-	FRELE(fp, p);
 	return (error);
 }
 
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