Btrfs: do not strdup non existent strings
authorJosef Bacik <jbacik@fusionio.com>
Thu, 2 Aug 2012 14:23:59 +0000 (10:23 -0400)
committerChris Mason <chris.mason@oracle.com>
Tue, 28 Aug 2012 20:53:29 +0000 (16:53 -0400)
When we close devices we add back empty devices for some reason that escapes
me.  In the case of a missing dev we don't allocate an rcu_string for it's
name, so check to see if the device has a name and if it doesn't don't
bother strdup()'ing it.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
fs/btrfs/volumes.c

index b8708f994e679a559af68b90b3135b2b8fa2a9ac..3b394503bd4e775d420b345539b0742ebad35586 100644 (file)
@@ -569,9 +569,11 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
                memcpy(new_device, device, sizeof(*new_device));
 
                /* Safe because we are under uuid_mutex */
-               name = rcu_string_strdup(device->name->str, GFP_NOFS);
-               BUG_ON(device->name && !name); /* -ENOMEM */
-               rcu_assign_pointer(new_device->name, name);
+               if (device->name) {
+                       name = rcu_string_strdup(device->name->str, GFP_NOFS);
+                       BUG_ON(device->name && !name); /* -ENOMEM */
+                       rcu_assign_pointer(new_device->name, name);
+               }
                new_device->bdev = NULL;
                new_device->writeable = 0;
                new_device->in_fs_metadata = 0;