Btrfs: fix NULL pointer crash of deleting a seed device

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 <lists@colorremedies.com> Reported-by: Chris Murphy <lists@colorremedies.com> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Chris Mason <clm@fb.com>
mariux64 · Jun 10, 2014 · 29cc83f · 29cc83f
1 parent f017f15
commit 29cc83f
Showing 1 changed file with 8 additions and 4 deletions.
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
@@ -6146,10 +6146,14 @@ void btrfs_init_devices_late(struct btrfs_fs_info *fs_info)
 	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)