From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754849AbbHEWBU (ORCPT ); Wed, 5 Aug 2015 18:01:20 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:38688 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932158AbbHEVub (ORCPT ); Wed, 5 Aug 2015 17:50:31 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Filipe Manana , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 076/107] Btrfs: fix memory leak in the extent_same ioctl Date: Wed, 5 Aug 2015 14:49:08 -0700 Message-Id: <1438811379-384-77-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438811379-384-1-git-send-email-kamal@canonical.com> References: <1438811379-384-1-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 3.19.8-ckt5 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Filipe Manana commit 497b4050e0eacd4c746dd396d14916b1e669849d upstream. We were allocating memory with memdup_user() but we were never releasing that memory. This affected pretty much every call to the ioctl, whether it deduplicated extents or not. This issue was reported on IRC by Julian Taylor and on the mailing list by Marcel Ritter, credit goes to them for finding the issue. Reported-by: Julian Taylor Reported-by: Marcel Ritter Signed-off-by: Filipe Manana Reviewed-by: Mark Fasheh Signed-off-by: Kamal Mostafa --- fs/btrfs/ioctl.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 0dc23cd..6bd84a8 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2931,7 +2931,7 @@ out_unlock: static long btrfs_ioctl_file_extent_same(struct file *file, struct btrfs_ioctl_same_args __user *argp) { - struct btrfs_ioctl_same_args *same; + struct btrfs_ioctl_same_args *same = NULL; struct btrfs_ioctl_same_extent_info *info; struct inode *src = file_inode(file); u64 off; @@ -2961,6 +2961,7 @@ static long btrfs_ioctl_file_extent_same(struct file *file, if (IS_ERR(same)) { ret = PTR_ERR(same); + same = NULL; goto out; } @@ -3031,6 +3032,7 @@ static long btrfs_ioctl_file_extent_same(struct file *file, out: mnt_drop_write_file(file); + kfree(same); return ret; } -- 1.9.1