From 487ba70126ddcde8f889e20617b927c9d716c792 Mon Sep 17 00:00:00 2001
From: Ruslan Ermilov <ru@nginx.com>
Date: Thu, 26 Apr 2012 12:58:42 +0000
Subject: [PATCH] Fixed segmentation fault in ngx_resolver_create_name_query().

If name passed for resolution was { 0, NULL } (e.g. as a result
of name server returning CNAME pointing to ".") pointer wrapped
to (void *) -1 resulting in segmentation fault on an attempt to
dereference it.

Reported by Lanshun Zhou.
---
 src/core/ngx_resolver.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 02c484da6..ecf97d7f7 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -1834,6 +1834,10 @@ ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
     p--;
     *p-- = '\0';
 
+    if (ctx->name.len == 0)  {
+        return NGX_DECLINED;
+    }
+
     for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) {
         if (*s != '.') {
             *p = *s;