tls: return -EBUSY if crypto_info is already set

[ Upstream commit 877d17c79b66466942a836403773276e34fe3614 ]

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@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 7075709..06688ed 100644 (file)
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -364,8 +364,10 @@ 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;
+       }
 
        switch (tmp_crypto_info.cipher_type) {
        case TLS_CIPHER_AES_GCM_128: {