bna: Check for NULL before deref in bnad_cb_tx_cleanup

Reported-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/bna/bnad.c b/drivers/net/bna/bnad.c
index 8158fb93cb4c..e380c0e88f4f 100644
--- a/drivers/net/bna/bnad.c
+++ b/drivers/net/bna/bnad.c
@@ -867,11 +867,12 @@ bnad_cb_tx_resume(struct bnad *bnad, struct bna_tcb *tcb)
 static void
 bnad_cb_tx_cleanup(struct bnad *bnad, struct bna_tcb *tcb)
 {
-        struct bnad_unmap_q *unmap_q = tcb->unmap_q;
+        struct bnad_unmap_q *unmap_q;
 
         if (!tcb || (!tcb->unmap_q))
                 return;
 
+        unmap_q = tcb->unmap_q;
         if (!unmap_q->unmap_array)
                 return;