netdev - [PATCH net-next] TLS: Fix length check in do_tls_getsockopt

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Message-ID: <5b6ff892-fd27-94c6-045a-70c6ab721fb3@gmail.com>
Date:   Thu, 6 Jul 2017 00:56:36 -0400
From:   Matthias Rosenfelder <mrosenfelder.lkml@...il.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, dan.carpenter@...cle.com,
        davejwatson@...com, aviadye@...lanox.com, ilyal@...lanox.com
Subject: [PATCH net-next] TLS: Fix length check in do_tls_getsockopt_tx()

copy_to_user() copies the struct the pointer is pointing to, but the
length check compares against sizeof(pointer) and not sizeof(struct).
On 32-bit the size is probably the same, so it might have worked
accidentally.

Signed-off-by: Matthias Rosenfelder <mrosenfelder.lkml@...il.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 a03130a..60aff60 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -272,7 +272,7 @@ static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 		goto out;
 	}
 
-	if (len == sizeof(crypto_info)) {
+	if (len == sizeof(*crypto_info)) {
 		if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 			rc = -EFAULT;
 		goto out;
-- 
2.8.3