[PATCH 3.12 167/181] Btrfs: fix NULL pointer crash of deleting a seed device
From: Jiri Slaby
Date: Mon Jun 30 2014 - 08:51:32 EST
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
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 <lists@xxxxxxxxxxxxxxxxx>
Reported-by: Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/btrfs/volumes.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 258cd6ec3bd2..f0f50531c6c3 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6051,10 +6051,14 @@ 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)
--
2.0.0
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