net/bnxt: fix null dereference in interrupt handler

Coverity reports that pointer "cpr->cp_ring_struct" may be
dereferenced with null value. This patch fixes this.

Coverity issue: 372063
Fixes: 5ed30db87fa8 ("net/bnxt: fix missing barriers in completion handling")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>

diff --git a/drivers/net/bnxt/bnxt_irq.c b/drivers/net/bnxt/bnxt_irq.c
index ebdac83..122a1f9 100644 (file)
--- a/drivers/net/bnxt/bnxt_irq.c
+++ b/drivers/net/bnxt/bnxt_irq.c
@@ -33,7 +33,6 @@ void bnxt_int_handler(void *param)
                return;
 
        raw_cons = cpr->cp_raw_cons;
-       cp_ring_size = cpr->cp_ring_struct->ring_size;
        pthread_mutex_lock(&bp->def_cp_lock);
        while (1) {
                if (!cpr || !cpr->cp_ring_struct || !cpr->cp_db.doorbell) {
@@ -46,6 +45,7 @@ void bnxt_int_handler(void *param)
                        return;
                }
 
+               cp_ring_size = cpr->cp_ring_struct->ring_size;
                cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
                cmp = &cpr->cp_desc_ring[cons];