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virtio-blk: fix implicit overflow on virtio_max_dma_size 

[ Upstream commit fafb51a67f ]

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@bytedance.com>
Message-Id: <20230904061045.510460-1-pizhenwei@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
zhenwei pi 2023-09-04 14:10:45 +08:00 committed by Greg Kroah-Hartman
parent a5a583fbb0
commit d667fe301d
1 changed files with 3 additions and 1 deletions
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4
drivers/block/virtio_blk.c
View File

@ -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. */