[PATCH 3.8 21/81] ext4: fix memory leak in xattr

[Kamal Mostafa]

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

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

From: Dave Jones <davej at redhat.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 at fedoraproject.org>
Signed-off-by: "Theodore Ts'o" <tytso at mit.edu>
Reviewed-by: Eric Sandeen <sandeen at redhat.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 fs/ext4/xattr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index b93846b..f88c442 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1356,6 +1356,8 @@ 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;
-- 
1.8.1.2