netdev - [PATCH] net/tls: Fix inverted error codes to avoid endless loop

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Message-ID: <OF6F0DE70F.1C59BE55-ONC12581F3.0066F1BE-C12581F3.0068093A@avm.de>
Date:   Mon, 11 Dec 2017 19:56:21 +0100
From:   r.hering@....de
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: [PATCH] net/tls: Fix inverted error codes to avoid endless loop

sendfile() calls can hang endless with using Kernel TLS if a socket error 
occurs.
Socket error codes must be inverted by Kernel TLS before returning because
they are stored with positive sign. If returned non-inverted they are
interpreted as number of bytes sent, causing endless looping of the
splice mechanic behind sendfile().

Signed-off-by: Robert Hering <r.hering@....de>
---
diff --git a/include/net/tls.h b/include/net/tls.h
index 936cfc5..9185e53 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -170,7 +170,7 @@ static inline bool tls_is_pending_open_record(struct 
tls_context *tls_ctx)

 static inline void tls_err_abort(struct sock *sk)
 {
-       sk->sk_err = -EBADMSG;
+       sk->sk_err = EBADMSG;
        sk->sk_error_report(sk);
 }

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 73d1921..9773571 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -391,7 +391,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr 
*msg, size_t size)

        while (msg_data_left(msg)) {
                if (sk->sk_err) {
-                       ret = sk->sk_err;
+                       ret = -sk->sk_err;
                        goto send_end;
                }

@@ -544,7 +544,7 @@ int tls_sw_sendpage(struct sock *sk, struct page 
*page,
                size_t copy, required_size;

                if (sk->sk_err) {
-                       ret = sk->sk_err;
+                       ret = -sk->sk_err;
                        goto sendpage_end;
                }