tls: reset crypto_info when do_tls_setsockopt_tx fails

[ Upstream commit 6db959c82eb039a151d95a0f8b7dea643657327a ]

The current code copies directly from userspace to ctx->crypto_send, but
doesn't always reinitialize it to 0 on failure. This causes any
subsequent attempt to use this setsockopt to fail because of the
TLS_CRYPTO_INFO_READY check, eventhough crypto_info is not actually
ready.

This should result in a correctly set up socket after the 3rd call, but
currently it does not:

    size_t s = sizeof(struct tls12_crypto_info_aes_gcm_128);
    struct tls12_crypto_info_aes_gcm_128 crypto_good = {
        .info.version = TLS_1_2_VERSION,
        .info.cipher_type = TLS_CIPHER_AES_GCM_128,
    };

    struct tls12_crypto_info_aes_gcm_128 crypto_bad_type = crypto_good;
    crypto_bad_type.info.cipher_type = 42;

    setsockopt(sock, SOL_TLS, TLS_TX, &crypto_bad_type, s);
    setsockopt(sock, SOL_TLS, TLS_TX, &crypto_good, s - 1);
    setsockopt(sock, SOL_TLS, TLS_TX, &crypto_good, s);

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 06688ed..282361a 100644 (file)
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -373,7 +373,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
        case TLS_CIPHER_AES_GCM_128: {
                if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
                        rc = -EINVAL;
-                       goto out;
+                       goto err_crypto_info;
                }
                rc = copy_from_user(
                  crypto_info,
@@ -388,7 +388,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
        }
        default:
                rc = -EINVAL;
-               goto out;
+               goto err_crypto_info;
        }
 
        ctx->sk_write_space = sk->sk_write_space;