* [PATCH] virtio: reject shm region if length is zero
@ 2025-05-11 11:30 Sami
0 siblings, 0 replies; only message in thread
From: Sami @ 2025-05-11 11:30 UTC (permalink / raw)
To: mst; +Cc: jasowang, xuanzhuo, eperezma, virtualization, linux-kernel,
Sami Uddin
From: Sami Uddin <sami.md.ko@gmail.com>
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>
---
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
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