[PATCH] virtio: reject shm region if length is zero

[Sami]

From: Sami Uddin <sami.md.ko@xxxxxxxxx>

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@xxxxxxxxx>
---
 include/linux/virtio_config.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 169c7d367fac..f4fac027e830 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -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 == 0)
+		return false;
 	if (!vdev->config->get_shm_region)
 		return false;
 	return vdev->config->get_shm_region(vdev, region, id);
-- 
2.34.1