[dpdk-dev] [PATCH] enic: fix seg fault when releasing queues

[John Daley <johndale@cisco.com>]

If device configuration failed due to a lack of resources, like if
there were more queues requested than available, the queue release
function is called with NULL pointers which were being dereferenced.

Skip releasing queues if they are NULL pointers. Also, if configuration
fails due to lack of resources, be more specific about which resources
are lacking.

Fixes: fefed3d1e62c ("enic: new driver")
Signed-off-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic_main.c | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index bbbe660..a3eb4e3 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -467,14 +467,16 @@ 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);
+	if (rxq != NULL) {
+		struct vnic_rq *rq = (struct vnic_rq *)rxq;
+		struct enic *enic = vnic_dev_priv(rq->vdev);
 
-	enic_rxmbuf_queue_release(enic, rq);
-	rte_free(rq->mbuf_ring);
-	rq->mbuf_ring = NULL;
-	vnic_rq_free(rq);
-	vnic_cq_free(&enic->cq[rq->index]);
+		enic_rxmbuf_queue_release(enic, rq);
+		rte_free(rq->mbuf_ring);
+		rq->mbuf_ring = NULL;
+		vnic_rq_free(rq);
+		vnic_cq_free(&enic->cq[rq->index]);
+	}
 }
 
 void enic_start_wq(struct enic *enic, uint16_t queue_idx)
@@ -841,16 +843,22 @@ int enic_set_vnic_res(struct enic *enic)
 {
 	struct rte_eth_dev *eth_dev = enic->rte_dev;
 
-	if ((enic->rq_count < eth_dev->data->nb_rx_queues) ||
-		(enic->wq_count < eth_dev->data->nb_tx_queues)) {
-		dev_err(dev, "Not enough resources configured, aborting\n");
+	if (enic->rq_count < eth_dev->data->nb_rx_queues) {
+		dev_err(dev, "Not enough Receive queues. Requested:%u, Configured:%u\n",
+			eth_dev->data->nb_rx_queues, enic->rq_count);
+		return -1;
+	}
+	if (enic->wq_count < eth_dev->data->nb_tx_queues) {
+		dev_err(dev, "Not enough Transmit queues. Requested:%u, Configured:%u\n",
+			eth_dev->data->nb_tx_queues, enic->wq_count);
 		return -1;
 	}
 
 	enic->rq_count = eth_dev->data->nb_rx_queues;
 	enic->wq_count = eth_dev->data->nb_tx_queues;
 	if (enic->cq_count < (enic->rq_count + enic->wq_count)) {
-		dev_err(dev, "Not enough resources configured, aborting\n");
+		dev_err(dev, "Not enough Completion queues. Required:%u, Configured:%u\n",
+			enic->rq_count + enic->wq_count, enic->cq_count);
 		return -1;
 	}
 
-- 
2.7.0