[dpdk-dev] [PATCH] sched: fix segmentation fault when freeing port

[Jan Blunck <jblunck@infradead.org>]

From: Alan Dewar <adewar@brocade.com>

Prevent a segmentation fault in rte_sched_port_free by only accessing
the port structure after the NULL pointer check has been made.

Fixes: 7b3c4f35 ("sched: fix releasing enqueued packets")

Signed-off-by: Alan Dewar <adewar@brocade.com>
Signed-off-by: Jan Blunck <jblunck@infradead.org>
---
 lib/librte_sched/rte_sched.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index e6dace2..614705d 100644
--- a/lib/librte_sched/rte_sched.c
+++ b/lib/librte_sched/rte_sched.c
@@ -735,12 +735,14 @@ void
 rte_sched_port_free(struct rte_sched_port *port)
 {
 	uint32_t qindex;
-	uint32_t n_queues_per_port = rte_sched_port_queues_per_port(port);
+	uint32_t n_queues_per_port;
 
 	/* Check user parameters */
 	if (port == NULL)
 		return;
 
+	n_queues_per_port = rte_sched_port_queues_per_port(port);
+
 	/* Free enqueued mbufs */
 	for (qindex = 0; qindex < n_queues_per_port; qindex++) {
 		struct rte_mbuf **mbufs = rte_sched_port_qbase(port, qindex);
-- 
2.7.4