Cc Paolo, Stefan, Xuan and linux-block.
On 10/19/23 17:52, Michael S. Tsirkin wrote:
On Thu, Oct 19, 2023 at 05:43:55PM +0800, zhenwei pi wrote:
Hi Michael,
This seems to have been ignored as you suggested.
LINK: https://www.spinics.net/lists/linux-virtualization/msg63015.html
Pls Cc more widely then:
Paolo Bonzini <pbonzini@xxxxxxxxxx> (reviewer:VIRTIO BLOCK AND SCSI DRIVERS)
Stefan Hajnoczi <stefanha@xxxxxxxxxx> (reviewer:VIRTIO BLOCK AND SCSI DRIVERS)
Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> (reviewer:VIRTIO CORE AND NET DRIVERS)
Jens Axboe <axboe@xxxxxxxxx> (maintainer:BLOCK LAYER)
linux-block@xxxxxxxxxxxxxxx (open list:BLOCK LAYER)
would all be good people to ask to review this.
On 9/4/23 14:10, zhenwei pi wrote:
The following codes have an implicit conversion from size_t to u32:
(u32)max_size = (size_t)virtio_max_dma_size(vdev);
This may lead overflow, Ex (size_t)4G -> (u32)0. Once
virtio_max_dma_size() has a larger size than U32_MAX, use U32_MAX
instead.
Signed-off-by: zhenwei pi <pizhenwei@xxxxxxxxxxxxx>
---
drivers/block/virtio_blk.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 1fe011676d07..4a4b9bad551e 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -1313,6 +1313,7 @@ static int virtblk_probe(struct virtio_device *vdev)
u16 min_io_size;
u8 physical_block_exp, alignment_offset;
unsigned int queue_depth;
+ size_t max_dma_size;
if (!vdev->config->get) {
dev_err(&vdev->dev, "%s failure: config access disabled\n",
@@ -1411,7 +1412,8 @@ static int virtblk_probe(struct virtio_device *vdev)
/* No real sector limit. */
blk_queue_max_hw_sectors(q, UINT_MAX);
- max_size = virtio_max_dma_size(vdev);
+ max_dma_size = virtio_max_dma_size(vdev);
+ max_size = max_dma_size > U32_MAX ? U32_MAX : max_dma_size;
/* Host can optionally specify maximum segment size and number of
* segments. */
--
zhenwei pi
--
zhenwei pi
