From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chris Murphy , Liu Bo , Chris Mason Subject: [PATCH 3.14 095/110] Btrfs: fix NULL pointer crash of deleting a seed device Date: Sat, 28 Jun 2014 10:47:32 -0700 Message-Id: <20140628174551.104913978@linuxfoundation.org> In-Reply-To: <20140628174545.354748696@linuxfoundation.org> References: <20140628174545.354748696@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Liu Bo commit 29cc83f69c8338ff8fd1383c9be263d4bdf52d73 upstream. Same as normal devices, seed devices should be initialized with fs_info->dev_root as well, otherwise we'll get a NULL pointer crash. Cc: Chris Murphy Reported-by: Chris Murphy Signed-off-by: Liu Bo Signed-off-by: Chris Mason Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/volumes.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -6057,10 +6057,14 @@ void btrfs_init_devices_late(struct btrf struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; struct btrfs_device *device; - mutex_lock(&fs_devices->device_list_mutex); - list_for_each_entry(device, &fs_devices->devices, dev_list) - device->dev_root = fs_info->dev_root; - mutex_unlock(&fs_devices->device_list_mutex); + while (fs_devices) { + mutex_lock(&fs_devices->device_list_mutex); + list_for_each_entry(device, &fs_devices->devices, dev_list) + device->dev_root = fs_info->dev_root; + mutex_unlock(&fs_devices->device_list_mutex); + + fs_devices = fs_devices->seed; + } } static void __btrfs_reset_dev_stats(struct btrfs_device *dev)