[fix] fix some potential crash bugs.

Author: winshining

README.md

@@ -66,7 +66,7 @@ Donate if you like this module. Many thanks to you!
 
 ## Installation
 
-### Install in RHEL/CentOS (Thanks [dvershinin](https://github.com/dvershinin))
+### Install in RHEL/CentOS (Thanks to [dvershinin](https://github.com/dvershinin))
 
 #### RHEL/CentOS 6, 7
 
@@ -89,7 +89,7 @@ Now configuration files named `http-flv.conf` for HTTP-FLV feature and `rtmp.con
 
     include /etc/nginx/http-flv/rtmp.conf;
 
-To enable this module, add the following to `/etc/nginx/nginx.conf` and reload NGINX:
+To enable this module, add the following to `/etc/nginx/nginx.conf` and start or reload NGINX:
 
     load_module modules/ngx_http_flv_live_module.so;
 

ngx_http_flv_live_module.c

@@ -1923,12 +1923,12 @@ ngx_http_flv_live_init_session(ngx_http_request_t *r,
     return s;
 
 failed:
-    if (s->out_pool) {
+    if (s && s->out_pool) {
         ngx_destroy_pool(s->out_pool);
         s->out_pool = NULL;
     }
 
-    if (s->in_streams_pool) {
+    if (s && s->in_streams_pool) {
         ngx_destroy_pool(s->in_streams_pool);
         s->in_streams_pool = NULL;
     }

ngx_rtmp_init.c

@@ -243,12 +243,12 @@ ngx_rtmp_init_session(ngx_connection_t *c, ngx_rtmp_addr_conf_t *addr_conf)
     return s;
 
 failed:
-    if (s->out_pool) {
+    if (s && s->out_pool) {
         ngx_destroy_pool(s->out_pool);
         s->out_pool = NULL;
     }
 
-    if (s->in_streams_pool) {
+    if (s && s->in_streams_pool) {
         ngx_destroy_pool(s->in_streams_pool);
         s->in_streams_pool = NULL;
     }