[dpdk-dev] [PATCH] virtio: fix crash if CQ is not negotiated
Damjan Marion
damarion at cisco.com
Mon May 25 12:20:52 CEST 2015
Fix NULL dereference if virtio control queue is not negotiated.
Signed-off-by: Damjan Marion <damarion at cisco.com>
---
drivers/net/virtio/virtio_ethdev.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index f74e413..3633fce 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -114,19 +114,20 @@ static int
virtio_send_command(struct virtqueue *vq, struct virtio_pmd_ctrl *ctrl,
int *dlen, int pkt_num)
{
- uint16_t head = vq->vq_desc_head_idx, i;
+ uint32_t head, i;
int k, sum = 0;
virtio_net_ctrl_ack status = ~0;
struct virtio_pmd_ctrl result;
ctrl->status = status;
- if (!vq->hw->cvq) {
+ if (!(vq && vq->hw->cvq)) {
PMD_INIT_LOG(ERR,
"%s(): Control queue is not supported.",
__func__);
return -1;
}
+ head = vq->vq_desc_head_idx;
PMD_INIT_LOG(DEBUG, "vq->vq_desc_head_idx = %d, status = %d, "
"vq->hw->cvq = %p vq = %p",
--
2.1.4
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