virtio-blk: fix implicit overflow on virtio_max_dma_size

[ Upstream commit fafb51a67fb883eb2dde352539df939a251851be ]

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>

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 1fe0116..4a4b9ba 100644 (file)
--- 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. */