linux-kernel - [PATCH 3.4 114/146] fs, omfs: add NULL terminator in the end up the token list

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Message-Id: <1442307861-32031-114-git-send-email-lizf@kernel.org>
Date:	Tue, 15 Sep 2015 17:03:49 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>,
	Bob Copeland <me@...copeland.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 114/146] fs, omfs: add NULL terminator in the end up the token list

From: Sasha Levin <sasha.levin@...cle.com>

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit dcbff39da3d815f08750552fdd04f96b51751129 upstream.

match_token() expects a NULL terminator at the end of the token list so
that it would know where to stop.  Not having one causes it to overrun
to invalid memory.

In practice, passing a mount option that omfs didn't recognize would
sometimes panic the system.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: Bob Copeland <me@...copeland.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 fs/omfs/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index dbc8422..798dedc 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -361,7 +361,7 @@ nomem:
 }
 
 enum {
-	Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask
+	Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_err
 };
 
 static const match_table_t tokens = {
@@ -370,6 +370,7 @@ static const match_table_t tokens = {
 	{Opt_umask, "umask=%o"},
 	{Opt_dmask, "dmask=%o"},
 	{Opt_fmask, "fmask=%o"},
+	{Opt_err, NULL},
 };
 
 static int parse_options(char *options, struct omfs_sb_info *sbi)
-- 
1.9.1

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