qed: prevent possible double-frees of the chains

Zero-initialize chain on qed_chain_free(), so it couldn't be freed
twice and provoke undefined behaviour.

Signed-off-by: Alexander Lobakin <alobakin@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_chain.c b/drivers/net/ethernet/qlogic/qed/qed_chain.c
index bab02ff..917b783 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_chain.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_chain.c
@@ -92,8 +92,10 @@ void qed_chain_free(struct qed_dev *cdev, struct qed_chain *chain)
                qed_chain_free_pbl(cdev, chain);
                break;
        default:
-               break;
+               return;
        }
+
+       qed_chain_init_mem(chain, NULL, 0);
 }
 
 static int