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virtio: reject shm region if length is zero

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Prevent usage of shared memory regions where the length is zero,
as such configurations are not valid and may lead to unexpected behavior.

Signed-off-by: Sami Uddin <sami.md.ko@gmail.com>
Message-Id: <20250511222153.2332-1-sami.md.ko@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Sami Uddin 2025-05-12 07:51:53 +09:30 committed by Michael S. Tsirkin
parent 9d4f22fd56
commit 206cc44588
1 changed files with 2 additions and 0 deletions
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2
include/linux/virtio_config.h
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@ -329,6 +329,8 @@ static inline
bool virtio_get_shm_region(struct virtio_device *vdev,
struct virtio_shm_region *region, u8 id)
{
if (!region->len)
return false;
if (!vdev->config->get_shm_region)
return false;
return vdev->config->get_shm_region(vdev, region, id);