[nginx] QUIC: handle callback errors in compat.

[Roman Arutyunyan]

details:   https://hg.nginx.org/nginx/rev/3db945fda515
branches:  
changeset: 9164:3db945fda515
user:      Vladimir Khomutov <vl at inspert.ru>
date:      Fri Sep 22 19:23:57 2023 +0400
description:
QUIC: handle callback errors in compat.

The error may be triggered in add_handhshake_data() by incorrect transport
parameter sent by client.  The expected behaviour in this case is to close
connection complaining about incorrect parameter.  Currently the connection
just times out.

diffstat:

 src/event/quic/ngx_event_quic_openssl_compat.c |  14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diffs (35 lines):

diff -r 32b5aaebcca5 -r 3db945fda515 src/event/quic/ngx_event_quic_openssl_compat.c
--- a/src/event/quic/ngx_event_quic_openssl_compat.c	Wed Sep 13 17:48:15 2023 +0400
+++ b/src/event/quic/ngx_event_quic_openssl_compat.c	Fri Sep 22 19:23:57 2023 +0400
@@ -408,7 +408,9 @@ ngx_quic_compat_message_callback(int wri
                        "quic compat tx %s len:%uz ",
                        ngx_quic_level_name(level), len);
 
-        (void) com->method->add_handshake_data(ssl, level, buf, len);
+        if (com->method->add_handshake_data(ssl, level, buf, len) != 1) {
+            goto failed;
+        }
 
         break;
 
@@ -420,11 +422,19 @@ ngx_quic_compat_message_callback(int wri
                            "quic compat %s alert:%ui len:%uz ",
                            ngx_quic_level_name(level), alert, len);
 
-            (void) com->method->send_alert(ssl, level, alert);
+            if (com->method->send_alert(ssl, level, alert) != 1) {
+                goto failed;
+            }
         }
 
         break;
     }
+
+    return;
+
+failed:
+
+    ngx_post_event(&qc->close, &ngx_posted_events);
 }