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[PATCH v3 2/3] hw/virtio: Acquire RCU read lock in virtqueue_packed_drop
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From: |
Philippe Mathieu-Daudé |
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Subject: |
[PATCH v3 2/3] hw/virtio: Acquire RCU read lock in virtqueue_packed_drop_all() |
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Date: |
Mon, 6 Sep 2021 12:43:17 +0200 |
vring_get_region_caches() must be called with the RCU read lock
acquired. virtqueue_packed_drop_all() does not, and uses the
'caches' pointer. Fix that by using the RCU_READ_LOCK_GUARD()
macro.
Reported-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
hw/virtio/virtio.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 97f60017466..7d3bf9091ee 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1704,6 +1704,8 @@ static unsigned int virtqueue_packed_drop_all(VirtQueue
*vq)
VirtIODevice *vdev = vq->vdev;
VRingPackedDesc desc;
+ RCU_READ_LOCK_GUARD();
+
caches = vring_get_region_caches(vq);
if (!caches) {
return 0;
--
2.31.1