diff options
| author | zhenwei pi <pizhenwei@bytedance.com> | 2023-09-04 09:10:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 20:07:02 +0300 |
| commit | 472bd4787406bef2e8b41ee4c74d960a06a49a48 (patch) | |
| tree | 2dc9dda30b843273d8c02a78e2e415710c1d8860 | |
| parent | 32b17bc21f8e8961b54e3666d0eecf8fffb38678 (diff) | |
| download | linux-472bd4787406bef2e8b41ee4c74d960a06a49a48.tar.xz | |
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>
| -rw-r--r-- | drivers/block/virtio_blk.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index a7697027ce43..efa5535a8e1d 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -900,6 +900,7 @@ 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", @@ -998,7 +999,8 @@ static int virtblk_probe(struct virtio_device *vdev) /* No real sector limit. */ blk_queue_max_hw_sectors(q, -1U); - 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. */ |