upstream commit

Switch to recallocarray() for a few operations.  Both
growth and shrinkage are handled safely, and there also is no need for
preallocation dances. Future changes in this area will be less error prone.
Review and one bug found by markus

Upstream-ID: 822d664d6a5a1d10eccb23acdd53578a679d5065

1 files changed, 2 insertions, 6 deletions

diff --git a/scp.c b/scp.c
index f9f48e07..a533eb09 100644
--- a/scp.c
+++ b/scp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: scp.c,v 1.191 2017/05/02 08:06:33 jmc Exp $ */
+/* $OpenBSD: scp.c,v 1.192 2017/05/31 09:15:42 deraadt Exp $ */
 /*
  * scp - secure remote copy.  This is basically patched BSD rcp which
  * uses ssh to do the data transfer (instead of using rcmd).
@@ -1368,11 +1368,7 @@ allocbuf(BUF *bp, int fd, int blksize)
 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
 	if (bp->cnt >= size)
 		return (bp);
-	if (bp->buf == NULL)
-		bp->buf = xmalloc(size);
-	else
-		bp->buf = xreallocarray(bp->buf, 1, size);
-	memset(bp->buf, 0, size);
+	bp->buf = xrecallocarray(bp->buf, bp->cnt, size, 1);
 	bp->cnt = size;
 	return (bp);
 }