sched: fix crash when freeing port

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")
Cc: stable@dpdk.org
Signed-off-by: Alan Dewar <adewar@brocade.com>
Signed-off-by: Jan Blunck <jblunck@infradead.org>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index e6dace2..614705d 100644 (file)
--- 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);