Btrfs-progs: skip open devices which is missing

A device can be added to the device list without getting a name, so we may
access to illegal addresses while opening devices with their name.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/volumes.c b/volumes.c
index d6f81f87..013bfd5a 100644
--- a/volumes.c
+++ b/volumes.c
@@ -186,6 +186,10 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags)
 
 	list_for_each(cur, head) {
 		device = list_entry(cur, struct btrfs_device, dev_list);
+		if (!device->name) {
+			printk("no name for device %llu, skip it now\n", device->devid);
+			continue;
+		}
 
 		fd = open(device->name, flags);
 		if (fd < 0) {