Re: [PATCH] virtio_blk: fix panic in initialization error path

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On 2017年01月10日 03:44, Omar Sandoval wrote:
From: Omar Sandoval <osandov@xxxxxx>

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@xxxxxx>
---
  drivers/block/virtio_blk.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 5545a679abd8..8587361e5356 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -628,11 +628,12 @@ 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;

Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
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