From: Igor Sysoev <igor@sysoev.ru>
Date: Wed, 9 Nov 2011 13:54:07 +0000 (+0000)
Subject: Fixed compression pointer processing in DNS response greater than 255 bytes.
X-Git-Tag: release-1.1.8~17
X-Git-Url: http://git.kaiwu.me/postgresql/log/contrib/postgres_fdw/postgres_fdw.c?a=commitdiff_plain;h=eb499bab59d2a75b2abb028139ece53a5ddbd8d8;p=nginx.git

Fixed compression pointer processing in DNS response greater than 255 bytes.

Thanks to Ben Hawkes.
---

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 268faa456..35818a7ae 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -1952,7 +1952,13 @@ done:
     n = *src++;
 
     for ( ;; ) {
-        if (n != 0xc0) {
+        if (n & 0xc0) {
+            n = ((n & 0x3f) << 8) + *src;
+            src = &buf[n];
+
+            n = *src++;
+
+        } else {
             ngx_memcpy(dst, src, n);
             dst += n;
             src += n;
@@ -1962,12 +1968,6 @@ done:
             if (n != 0) {
                 *dst++ = '.';
             }
-
-        } else {
-            n = ((n & 0x3f) << 8) + *src;
-            src = &buf[n];
-
-            n = *src++;
         }
 
         if (n == 0) {