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btrfs: test for valid bdev before kobj removal in btrfs_rm_device 

commit 99994cd btrfs: dev delete should remove sysfs entry
added a btrfs_kobj_rm_device, which dereferences device->bdev...
right after we check whether device->bdev might be NULL.

I don't honestly know if it's possible to have a NULL device->bdev
here, but assuming that it is (given the test), we need to move
the kobject removal to be under that test.

(Coverity spotted this)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Eric Sandeen 2014-07-07 12:34:49 -05:00 committed by Chris Mason
parent 98ce2deda2
commit 0bfaa9c5cb
1 changed files with 4 additions and 4 deletions
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8
fs/btrfs/volumes.c
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@ -1680,11 +1680,11 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
if (device->bdev == root->fs_info->fs_devices->latest_bdev)
root->fs_info->fs_devices->latest_bdev = next_device->bdev;
if (device->bdev)
if (device->bdev) {
device->fs_devices->open_devices--;
/* remove sysfs entry */
btrfs_kobj_rm_device(root->fs_info, device);
/* remove sysfs entry */
btrfs_kobj_rm_device(root->fs_info, device);
}
call_rcu(&device->rcu, free_device);