6.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Li Zhang <zhanglikernel@xxxxxxxxx>
[ Upstream commit c8fae27d141a32a1624d0d0d5419d94252824498 ]
[bug]
In the virtio_pci_common.c function vp_del_vqs, vp_dev->is_avq is involved
to determine whether it is admin virtqueue, but this function vp_dev->is_avq
may be empty. For installations, virtio_pci_legacy does not assign a value
to vp_dev->is_avq.
[fix]
Check whether it is vp_dev->is_avq before use.
[test]
Test with virsh Attach device
Before this patch, the following command would crash the guest system
After applying the patch, everything seems to be working fine.
Signed-off-by: Li Zhang <zhanglikernel@xxxxxxxxx>
Message-Id: <1710566754-3532-1-git-send-email-zhanglikernel@xxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/virtio/virtio_pci_common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 584af7816532b..f6b0b00e4599f 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -236,7 +236,7 @@ void vp_del_vqs(struct virtio_device *vdev)
int i;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
- if (vp_dev->is_avq(vdev, vq->index))
+ if (vp_dev->is_avq && vp_dev->is_avq(vdev, vq->index))
continue;
if (vp_dev->per_vq_vectors) {
--
2.43.0
