From: Prasad J Pandit <p...@fedoraproject.org>
virtio back end uses set of buffers to facilitate I/O operations.
An infinite loop unfolds in virtqueue_pop() if a buffer was
of zero size. Add check to avoid it.
Reported-by: Li Qiang <liqiang...@360.cn>
Signed-off-by: Prasad J Pandit <p...@fedoraproject.org>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
hw/virtio/virtio.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 752b271..b4d0511 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -458,6 +458,11 @@ static void virtqueue_map_desc(unsigned int *p_num_sg,
hwaddr *addr, struct iove
unsigned num_sg = *p_num_sg;
assert(num_sg <= max_num_sg);
+ if (!sz) {
+ error_report("virtio: zero sized buffers are not allowed");
+ exit(1);
+ }
+
while (sz) {
hwaddr len = sz;
--
MST
