netdev - [PATCH net 2/3] tls: return -EBUSY if crypto

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Message-Id: <ff064374eaddc774aacfef413ef56db1d525934f.1516114791.git.sd@queasysnail.net>
Date:   Tue, 16 Jan 2018 16:04:27 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     netdev@...r.kernel.org
Cc:     Sabrina Dubroca <sd@...asysnail.net>,
        Boris Pismenny <borisp@...lanox.com>,
        Ilya Lesokhin <ilyal@...lanox.com>,
        Aviad Yehezkel <aviadye@...lanox.com>,
        Dave Watson <davejwatson@...com>
Subject: [PATCH net 2/3] tls: return -EBUSY if crypto_info is already set

do_tls_setsockopt_tx returns 0 without doing anything when crypto_info
is already set. Silent failure is confusing for users.

Fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 net/tls/tls_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index e07ee3ae0023..cdaaa9b8e84d 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -367,8 +367,10 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
 
 	crypto_info = &ctx->crypto_send;
 	/* Currently we don't support set crypto info more than one time */
-	if (TLS_CRYPTO_INFO_READY(crypto_info))
+	if (TLS_CRYPTO_INFO_READY(crypto_info)) {
+		rc = -EBUSY;
 		goto out;
+	}
 
 	rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 	if (rc) {
-- 
2.15.1