[PATCH 4.14 023/146] tls: dont override sk_write_space if tls_set_sw_offload fails.

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

commit ee181e5201e640a4b92b217e9eab2531dab57d2c upstream.

If we fail to enable tls in the kernel we shouldn't override
the sk_write_space callback

Fixes: 3c4d7559159b ('tls: kernel TLS support')
Signed-off-by: Ilya Lesokhin <ilyal@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/tls/tls_main.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index f88df514ad5f..33187e34599b 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -429,9 +429,6 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
 		goto err_crypto_info;
 	}
 
-	ctx->sk_write_space = sk->sk_write_space;
-	sk->sk_write_space = tls_write_space;
-
 	/* currently SW is default, we will have ethtool in future */
 	rc = tls_set_sw_offload(sk, ctx);
 	tx_conf = TLS_SW_TX;
@@ -440,6 +437,8 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
 
 	ctx->tx_conf = tx_conf;
 	update_sk_prot(sk, ctx);
+	ctx->sk_write_space = sk->sk_write_space;
+	sk->sk_write_space = tls_write_space;
 	goto out;
 
 err_crypto_info:
-- 
2.17.1