[PATCH] Avoid using the result of i2d_SSL_SESSION when the session is invalid

[Bart Warmerdam]

# HG changeset patch
# User Bart Warmerdam <bartw at xs4all.nl>
# Date 1497852211 -7200
#      Mon Jun 19 08:03:31 2017 +0200
# Branch i2d_ssl_session_length
# Node ID 079afb2cb4be3ef06d07e96d1a54cc359b971631
# Parent  d1816a2696de8c2faa1cd913a151e5f62a8620f3
Make sure to also take into account the 'return 0' response of 
i2d_SSL_SESSION, which is possible when the session is not valid

diff -r d1816a2696de -r 079afb2cb4be src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c     Fri Jun 16 18:15:58 2017 +0300
+++ b/src/event/ngx_event_openssl.c     Mon Jun 19 08:03:31 2017 +0200
@@ -2458,9 +2458,9 @@

      len = i2d_SSL_SESSION(sess, NULL);

-    /* do not cache too big session */
-
-    if (len > (int) NGX_SSL_MAX_SESSION_SIZE) {
+    /* do not cache too big or invalid session */
+
+    if (len > (int) NGX_SSL_MAX_SESSION_SIZE || len < 1) {
          return 0;
      }

diff -r d1816a2696de -r 079afb2cb4be 
src/http/ngx_http_upstream_round_robin.c
--- a/src/http/ngx_http_upstream_round_robin.c  Fri Jun 16 18:15:58 2017 
+0300
+++ b/src/http/ngx_http_upstream_round_robin.c  Mon Jun 19 08:03:31 2017 
+0200
@@ -755,9 +755,9 @@

          len = i2d_SSL_SESSION(ssl_session, NULL);

-        /* do not cache too big session */
+        /* do not cache too big or invalid session */

-        if (len > NGX_SSL_MAX_SESSION_SIZE) {
+         if (len > NGX_SSL_MAX_SESSION_SIZE || len < 1) {
              return;
          }

diff -r d1816a2696de -r 079afb2cb4be 
src/stream/ngx_stream_upstream_round_robin.c
--- a/src/stream/ngx_stream_upstream_round_robin.c      Fri Jun 16 
18:15:58 2017 +0300
+++ b/src/stream/ngx_stream_upstream_round_robin.c      Mon Jun 19 
08:03:31 2017 +0200
@@ -787,9 +787,9 @@

          len = i2d_SSL_SESSION(ssl_session, NULL);

-        /* do not cache too big session */
+        /* do not cache too big or invalid session */

-        if (len > NGX_SSL_MAX_SESSION_SIZE) {
+        if (len > NGX_SSL_MAX_SESSION_SIZE || len < 1) {
              return;
          }