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| author | Jeff Moyer <jmoyer@redhat.com> | 2017-01-09 15:20:31 -0500 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-10 13:30:50 -0700 |
| commit | 25b4acfc7de0fc4da3bfea3a316f7282c6fbde81 (patch) | |
| tree | 2a499c0910f948316a23003cacc43a29619299a5 /drivers/block/nbd.c | |
| parent | a14d749fcebe97ddf6af6db3d1f6ece85c9ddcb9 (diff) | |
| download | linux-25b4acfc7de0fc4da3bfea3a316f7282c6fbde81.tar.gz linux-25b4acfc7de0fc4da3bfea3a316f7282c6fbde81.tar.bz2 linux-25b4acfc7de0fc4da3bfea3a316f7282c6fbde81.zip | |
nbd: blk_mq_init_queue returns an error code on failure, not NULL
Additionally, don't assign directly to disk->queue, otherwise
blk_put_queue (called via put_disk) will choke (panic) on the errno
stored there.
Bug found by code inspection after Omar found a similar issue in
virtio_blk. Compile-tested only.
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/nbd.c')
| -rw-r--r-- | drivers/block/nbd.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 38c576f76d36..50a2020b5b72 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -1042,6 +1042,7 @@ static int __init nbd_init(void) return -ENOMEM; for (i = 0; i < nbds_max; i++) { + struct request_queue *q; struct gendisk *disk = alloc_disk(1 << part_shift); if (!disk) goto out; @@ -1067,12 +1068,13 @@ static int __init nbd_init(void) * every gendisk to have its very own request_queue struct. * These structs are big so we dynamically allocate them. */ - disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set); - if (!disk->queue) { + q = blk_mq_init_queue(&nbd_dev[i].tag_set); + if (IS_ERR(q)) { blk_mq_free_tag_set(&nbd_dev[i].tag_set); put_disk(disk); goto out; } + disk->queue = q; /* * Tell the block layer that we are not a rotational device |