From 04199332832568384202111ae0e75d90b69b0d01 Mon Sep 17 00:00:00 2001
From: Ruslan Ermilov <ru@nginx.com>
Date: Tue, 3 Dec 2013 15:11:24 +0400
Subject: [PATCH] Fixed null pointer dereference with
 $upstream_cache_last_modified.

---
 src/http/ngx_http_upstream.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 9570ccc7e..c148f38d0 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4555,7 +4555,8 @@ ngx_http_upstream_cache_last_modified(ngx_http_request_t *r,
 {
     u_char  *p;
 
-    if (!r->upstream->conf->cache_revalidate
+    if (r->upstream == NULL
+        || !r->upstream->conf->cache_revalidate
         || r->upstream->cache_status != NGX_HTTP_CACHE_EXPIRED
         || r->cache->last_modified == -1)
     {