SSL: fixed potential leak on memory allocation errors.

If ngx_pool_cleanup_add() fails, we have to clean just created SSL context
manually, thus appropriate call added.

Additionally, ngx_pool_cleanup_add() moved closer to ngx_ssl_create() in
the ngx_http_ssl_module, to make sure there are no leaks due to intermediate
code.

7 files changed, 15 insertions, 8 deletions

diff --git a/src/http/modules/ngx_http_grpc_module.c b/src/http/modules/ngx_http_grpc_module.c
index 18478b978..f59ecbda7 100644
--- a/src/http/modules/ngx_http_grpc_module.c
+++ b/src/http/modules/ngx_http_grpc_module.c
@@ -4650,6 +4650,7 @@ ngx_http_grpc_set_ssl(ngx_conf_t *cf, ngx_http_grpc_loc_conf_t *glcf)
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(glcf->upstream.ssl);
         return NGX_ERROR;
     }
 
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index d6a892217..3aafb9996 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -4270,6 +4270,7 @@ ngx_http_proxy_set_ssl(ngx_conf_t *cf, ngx_http_proxy_loc_conf_t *plcf)
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(plcf->upstream.ssl);
         return NGX_ERROR;
     }
 
diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index 1b2830d21..b3f8f4795 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -700,6 +700,15 @@ ngx_http_ssl_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
         return NGX_CONF_ERROR;
     }
 
+    cln = ngx_pool_cleanup_add(cf->pool, 0);
+    if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(&conf->ssl);
+        return NGX_CONF_ERROR;
+    }
+
+    cln->handler = ngx_ssl_cleanup_ctx;
+    cln->data = &conf->ssl;
+
 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 
     if (SSL_CTX_set_tlsext_servername_callback(conf->ssl.ctx,
@@ -723,14 +732,6 @@ ngx_http_ssl_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
                                           ngx_http_ssl_npn_advertised, NULL);
 #endif
 
-    cln = ngx_pool_cleanup_add(cf->pool, 0);
-    if (cln == NULL) {
-        return NGX_CONF_ERROR;
-    }
-
-    cln->handler = ngx_ssl_cleanup_ctx;
-    cln->data = &conf->ssl;
-
     if (ngx_http_ssl_compile_certificates(cf, conf) != NGX_OK) {
         return NGX_CONF_ERROR;
     }
diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
index 8b091101f..56dc236ef 100644
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -2359,6 +2359,7 @@ ngx_http_uwsgi_set_ssl(ngx_conf_t *cf, ngx_http_uwsgi_loc_conf_t *uwcf)
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(uwcf->upstream.ssl);
         return NGX_ERROR;
     }
 
diff --git a/src/mail/ngx_mail_ssl_module.c b/src/mail/ngx_mail_ssl_module.c
index 10e982ee8..5544f7522 100644
--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -370,6 +370,7 @@ ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(&conf->ssl);
         return NGX_CONF_ERROR;
     }
 
diff --git a/src/stream/ngx_stream_proxy_module.c b/src/stream/ngx_stream_proxy_module.c
index d7bdec270..127c8a4a4 100644
--- a/src/stream/ngx_stream_proxy_module.c
+++ b/src/stream/ngx_stream_proxy_module.c
@@ -2096,6 +2096,7 @@ ngx_stream_proxy_set_ssl(ngx_conf_t *cf, ngx_stream_proxy_srv_conf_t *pscf)
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(pscf->ssl);
         return NGX_ERROR;
     }
 
diff --git a/src/stream/ngx_stream_ssl_module.c b/src/stream/ngx_stream_ssl_module.c
index b099a805a..ec9524e07 100644
--- a/src/stream/ngx_stream_ssl_module.c
+++ b/src/stream/ngx_stream_ssl_module.c
@@ -690,6 +690,7 @@ ngx_stream_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
 
     cln = ngx_pool_cleanup_add(cf->pool, 0);
     if (cln == NULL) {
+        ngx_ssl_cleanup_ctx(&conf->ssl);
         return NGX_CONF_ERROR;
     }