Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965104AbbLBRvL (ORCPT ); Wed, 2 Dec 2015 12:51:11 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:43417 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933116AbbLBRA7 (ORCPT ); Wed, 2 Dec 2015 12:00:59 -0500 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Lukas Czerner , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 044/164] ext4: fix potential use after free in __ext4_journal_stop Date: Wed, 2 Dec 2015 08:58:15 -0800 Message-Id: <1449075615-20754-45-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449075615-20754-1-git-send-email-kamal@canonical.com> References: <1449075615-20754-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.19 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1701 Lines: 52 3.19.8-ckt11 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Lukas Czerner commit 6934da9238da947628be83635e365df41064b09b upstream. There is a use-after-free possibility in __ext4_journal_stop() in the case that we free the handle in the first jbd2_journal_stop() because we're referencing handle->h_err afterwards. This was introduced in 9705acd63b125dee8b15c705216d7186daea4625 and it is wrong. Fix it by storing the handle->h_err value beforehand and avoid referencing potentially freed handle. Fixes: 9705acd63b125dee8b15c705216d7186daea4625 Signed-off-by: Lukas Czerner Reviewed-by: Andreas Dilger Signed-off-by: Kamal Mostafa --- fs/ext4/ext4_jbd2.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c index d418431..e770c1ee 100644 --- a/fs/ext4/ext4_jbd2.c +++ b/fs/ext4/ext4_jbd2.c @@ -88,13 +88,13 @@ int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) return 0; } + err = handle->h_err; if (!handle->h_transaction) { - err = jbd2_journal_stop(handle); - return handle->h_err ? handle->h_err : err; + rc = jbd2_journal_stop(handle); + return err ? err : rc; } sb = handle->h_transaction->t_journal->j_private; - err = handle->h_err; rc = jbd2_journal_stop(handle); if (!err) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/