[PATCH net-next 04/15] qed: prevent possible double-frees of the chains

[Alexander Lobakin]

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

Signed-off-by: Alexander Lobakin <aloba...@marvell.com>
Signed-off-by: Igor Russkikh <irussk...@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalde...@marvell.com>
---
 drivers/net/ethernet/qlogic/qed/qed_chain.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_chain.c 
b/drivers/net/ethernet/qlogic/qed/qed_chain.c
index 40cc26f7f20b..fd2d985793dc 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_chain.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_chain.c
@@ -90,8 +90,10 @@ 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
-- 
2.25.1