From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755501Ab3J2SKK (ORCPT ); Tue, 29 Oct 2013 14:10:10 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:59641 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754971Ab3J2SKF (ORCPT ); Tue, 29 Oct 2013 14:10:05 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Dave Jones , "Theodore Ts'o" , Kamal Mostafa Subject: [PATCH 3.8 21/81] ext4: fix memory leak in xattr Date: Tue, 29 Oct 2013 11:03:42 -0700 Message-Id: <1383069882-11437-22-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1383069882-11437-1-git-send-email-kamal@canonical.com> References: <1383069882-11437-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.8.13.12 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Jones 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 Signed-off-by: "Theodore Ts'o" Reviewed-by: Eric Sandeen Signed-off-by: Kamal Mostafa --- 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