linux-kernel - [PATCH] nfs: Don't deref potentially NULL pointer returned by strsep

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Date:	Sun, 3 Jul 2011 09:40:12 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-nfs@...r.kernel.org
cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-kernel@...r.kernel.org, Gero Kuhlmann <gero@...inix.han.de>
Subject: [PATCH] nfs: Don't deref potentially NULL pointer returned by
 strsep

In fs/nfs/nfsroot.c:root_nfs_parse_options() we call strsep(), which
may return NULL, but we do not test the return value before
dereferencing the pointer.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 fs/nfs/nfsroot.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

  Compile tested only.

diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index c4744e1..b6ac860 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -191,6 +191,8 @@ static int __init root_nfs_parse_options(char *incoming, char *exppath,
 	 * Set the NFS remote path
 	 */
 	p = strsep(&incoming, ",");
+	if (!p)
+		return -1;
 	if (*p != '\0' && strcmp(p, "default") != 0)
 		if (root_nfs_copy(exppath, p, exppathlen))
 			return -1;
-- 
1.7.6


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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