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

From: Luis Henriques
Date: Mon Oct 28 2013 - 11:06:41 EST -stable review patch. If anyone has any objections, please let me know.


From: Dave Jones <davej@xxxxxxxxxx>

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@xxxxxxxxxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
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) {
new_extra_isize = s_min_extra_isize;
+ kfree(is); is = NULL;
+ kfree(bs); bs = NULL;
goto retry;
error = -1;

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