From: Susant Sahani <ssahani@redhat.com>
Date: Thu, 9 Jan 2014 20:27:49 +0000 (-0800)
Subject: Bug 3996: Malformed DNS reply leads to crash
X-Git-Tag: SQUID_3_5_0_1~430
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8185c30bedaf413aad342175edc5c867060ebec3;p=thirdparty%2Fsquid.git

Bug 3996: Malformed DNS reply leads to crash
---

diff --git a/src/dns_internal.cc b/src/dns_internal.cc
index fd3c43facd..a8f6837e07 100644
--- a/src/dns_internal.cc
+++ b/src/dns_internal.cc
@@ -1500,6 +1500,12 @@ idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, com
 
     vc->msglen = ntohs(vc->msglen);
 
+    if (!vc->msglen) {
+        if (Comm::IsConnOpen(conn))
+            conn->close();
+        return;
+    }
+
     vc->msg->init(vc->msglen, vc->msglen);
     AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC",
                                          CommIoCbPtrFun(idnsReadVC, vc));