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virtio_blk: fix panic in initialization error path

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If blk_mq_init_queue() returns an error, it gets assigned to
vblk->disk->queue. Then, when we call put_disk(), we end up calling
blk_put_queue() with the ERR_PTR, causing a bad dereference. Fix it by
only assigning to vblk->disk->queue on success.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-01-09 11:44:12 -08:00 committed by Jens Axboe
parent 25b4acfc7d
commit 6bf6b0aa3d
1 changed files with 2 additions and 1 deletions
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3
drivers/block/virtio_blk.c
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@ -630,11 +630,12 @@ static int virtblk_probe(struct virtio_device *vdev)
if (err)
goto out_put_disk;
q = vblk->disk->queue = blk_mq_init_queue(&vblk->tag_set);
q = blk_mq_init_queue(&vblk->tag_set);
if (IS_ERR(q)) {
err = -ENOMEM;
goto out_free_tags;
}
vblk->disk->queue = q;
q->queuedata = vblk;