From dfa31a2b110abd8c5515fcebf0b57aa6b63b7a08 Mon Sep 17 00:00:00 2001
From: lum <lum@cvs.openbsd.org>
Date: Sat, 1 Jun 2013 16:27:57 +0000
Subject: If popbuf() fails, calling function should return FALSE.

---
 usr.bin/mg/undo.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/usr.bin/mg/undo.c b/usr.bin/mg/undo.c
index 0976713ef2c..f95da63e951 100644
--- a/usr.bin/mg/undo.c
+++ b/usr.bin/mg/undo.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: undo.c,v 1.53 2013/03/25 11:39:38 florian Exp $ */
+/* $OpenBSD: undo.c,v 1.54 2013/06/01 16:27:56 lum Exp $ */
 /*
  * This file is in the public domain
  */
@@ -390,7 +390,8 @@ undo_dump(int f, int n)
 		return (FALSE);
 	bp->b_flag |= BFREADONLY;
 	bclear(bp);
-	popbuf(bp, WNONE);
+	if ((wp = popbuf(bp, WNONE)) == NULL)
+		return (FALSE);
 
 	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
 		if (wp->w_bufp == bp) {
-- 
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