[dpdk-dev] [PATCH v4 1/2] enic: fix seg fault when releasing queues

[John Daley <johndale@cisco.com>]

If device configuration failed due to a lack of resources, such as
if more queues are requested than are available, the queue release
functions are called with NULL pointers which were being dereferenced.

Skip releasing queues if they are NULL pointers.

Fixes: fefed3d1e62c ("enic: new driver")
Signed-off-by: John Daley <johndale@cisco.com>
---

v4: fix check for NULL before pointer is set

 drivers/net/enic/enic_main.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 996f999..738792e 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -426,9 +426,14 @@ int enic_alloc_intr_resources(struct enic *enic)
 
 void enic_free_rq(void *rxq)
 {
-	struct vnic_rq *rq = (struct vnic_rq *)rxq;
-	struct enic *enic = vnic_dev_priv(rq->vdev);
+	struct vnic_rq *rq;
+	struct enic *enic;
 
+	if (rxq == NULL)
+		return;
+
+	rq = (struct vnic_rq *)rxq;
+	enic = vnic_dev_priv(rq->vdev);
 	enic_rxmbuf_queue_release(enic, rq);
 	rte_free(rq->mbuf_ring);
 	rq->mbuf_ring = NULL;
@@ -514,9 +519,14 @@ err_exit:
 
 void enic_free_wq(void *txq)
 {
-	struct vnic_wq *wq = (struct vnic_wq *)txq;
-	struct enic *enic = vnic_dev_priv(wq->vdev);
+	struct vnic_wq *wq;
+	struct enic *enic;
+
+	if (txq == NULL)
+		return;
 
+	wq = (struct vnic_wq *)txq;
+	enic = vnic_dev_priv(wq->vdev);
 	rte_memzone_free(wq->cqmsg_rz);
 	vnic_wq_free(wq);
 	vnic_cq_free(&enic->cq[enic->rq_count + wq->index]);
-- 
2.7.0