netdev - [PATCH 2/3] tls: reset the crypto info if copy_from

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Message-Id: <1518597968-72686-2-git-send-email-borisp@mellanox.com>
Date:   Wed, 14 Feb 2018 10:46:07 +0200
From:   Boris Pismenny <borisp@...lanox.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     borisp@...lanox.com, ilyal@...lanox.com, aviadye@...lanox.com
Subject: [PATCH 2/3] tls: reset the crypto info if copy_from_user fails

copy_from_user could copy some partial information, as a result
TLS_CRYPTO_INFO_READY(crypto_info) could be true while crypto_info is
using uninitialzed data.

This patch resets crypto_info when copy_from_user fails.

fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Boris Pismenny <borisp@...lanox.com>
---
 net/tls/tls_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index a6c3702..c105f86 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -376,7 +376,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
 	rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 	if (rc) {
 		rc = -EFAULT;
-		goto out;
+		goto err_crypto_info;
 	}
 
 	/* check version */
-- 
1.8.3.1