From 94d450b38ba0fe63d3e2d027fa00a344f9579fb9 Mon Sep 17 00:00:00 2001 From: Yonghua Huang Date: Tue, 1 Jun 2021 10:25:27 +0800 Subject: [PATCH] dm: validate inputs in vq_endchains inputs shall be validated to avoid NULL pointer access. Tracked-On: #6129 Signed-off-by: Yonghua Huang --- devicemodel/hw/pci/virtio/virtio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/devicemodel/hw/pci/virtio/virtio.c b/devicemodel/hw/pci/virtio/virtio.c index f3104db57..88a5f1a5e 100644 --- a/devicemodel/hw/pci/virtio/virtio.c +++ b/devicemodel/hw/pci/virtio/virtio.c @@ -647,6 +647,9 @@ vq_endchains(struct virtio_vq_info *vq, int used_all_avail) uint16_t event_idx, new_idx, old_idx; int intr; + if (!vq || !vq->used) + return; + /* * Interrupt generation: if we're using EVENT_IDX, * interrupt if we've crossed the event threshold.