ext4: fix memory leak in xattr

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@fedoraproject.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index c081e34..03e9beb 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1350,6 +1350,8 @@ 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;