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Subject[PATCH v4] virtio-blk: Add validation for block size in config space
Date
This ensures that we will not use an invalid block size
in config space (might come from an untrusted device).

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
drivers/block/virtio_blk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index e4bd3b1fc3c2..e9d7747c3cc0 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -819,7 +819,7 @@ static int virtblk_probe(struct virtio_device *vdev)
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
struct virtio_blk_config, blk_size,
&blk_size);
- if (!err)
+ if (!err && blk_size >= SECTOR_SIZE && blk_size <= PAGE_SIZE)
blk_queue_logical_block_size(q, blk_size);
else
blk_size = queue_logical_block_size(q);
--
2.11.0
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