netdev - [PATCH net 6/6] chelsio/chtls: fix writing freed memory

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Message-Id: <20201019115025.24233-7-vinay.yadav@chelsio.com>
Date:   Mon, 19 Oct 2020 17:20:25 +0530
From:   Vinay Kumar Yadav <vinay.yadav@...lsio.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org
Cc:     secdev@...lsio.com, Vinay Kumar Yadav <vinay.yadav@...lsio.com>
Subject: [PATCH net 6/6] chelsio/chtls: fix writing freed memory

When chtls_sock *csk is freed, same memory can be allocated
to different csk in chtls_sock_create().
csk->cdev = NULL; statement might ends up modifying wrong
csk, eventually causing kernel panic.
removing (csk->cdev = NULL) statement as it is not required.

Fixes: 3a0a97838923 ("crypto/chtls: Fix chtls crash in connection cleanup")
Signed-off-by: Vinay Kumar Yadav <vinay.yadav@...lsio.com>
---
 drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
index bdb53fa41022..ec4f79049a06 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
@@ -483,7 +483,6 @@ void chtls_destroy_sock(struct sock *sk)
 	chtls_purge_write_queue(sk);
 	free_tls_keyid(sk);
 	kref_put(&csk->kref, chtls_sock_release);
-	csk->cdev = NULL;
 	if (sk->sk_family == AF_INET)
 		sk->sk_prot = &tcp_prot;
 #if IS_ENABLED(CONFIG_IPV6)
-- 
2.18.1