linux-kernel - [PATCH 3.5 12/64] ext4: fix memory leak in xattr

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Date:	Mon, 28 Oct 2013 14:47:31 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dave Jones <davej@...oraproject.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.5 12/64] ext4: fix memory leak in xattr

3.5.7.24 -stable review patch.  If anyone has any objections, please let me know.

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

From: Dave Jones <davej@...hat.com>

commit 6e4ea8e33b2057b85d75175dd89b93f5e26de3bc upstream.

If we take the 2nd retry path in ext4_expand_extra_isize_ea, we
potentionally return from the function without having freed these
allocations.  If we don't do the return, we over-write the previous
allocation pointers, so we leak either way.

Spotted with Coverity.

[ Fixed by tytso to set is and bs to NULL after freeing these
  pointers, in case in the retry loop we later end up triggering an
  error causing a jump to cleanup, at which point we could have a double
  free bug. -- Ted ]

Signed-off-by: Dave Jones <davej@...oraproject.org>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/ext4/xattr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 1d261e6..e979d5d 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1328,6 +1328,8 @@ retry:
 				    s_min_extra_isize) {
 					tried_min_extra_isize++;
 					new_extra_isize = s_min_extra_isize;
+					kfree(is); is = NULL;
+					kfree(bs); bs = NULL;
 					goto retry;
 				}
 				error = -1;
-- 
1.8.3.2

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