[PATCH net] net: tls: prevent false connection termination with offload

[Jakub Kicinski]

Only decrypt_internal() performs zero copy on rx, all paths
which don't hit decrypt_internal() must set zc to false,
otherwise tls_sw_recvmsg() may return 0 causing the application
to believe that that connection got closed.

Currently this happens with device offload when new record
is first read from.

Fixes: d069b780e367 ("tls: Fix tls_device receive")
Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Simon Horman <simon.hor...@netronome.com>
---
 net/tls/tls_sw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 4f821edeeae6..4741edf4bb1e 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1497,6 +1497,8 @@ static int decrypt_skb_update(struct sock *sk, struct 
sk_buff *skb,
 
                                return err;
                        }
+               } else {
+                       *zc = false;
                }
 
                rxm->full_len -= padding_length(ctx, tls_ctx, skb);
-- 
2.21.0