allow referencing of compressed label directly before another compressed label, thanks @giganteous

Peter van Dijk · Peter van Dijk · commit dc02ebf65ab4 · 2015-04-21T12:01:51.000+02:00
diff --git a/pdns/dnsparser.cc b/pdns/dnsparser.cc
@@ -471,7 +471,7 @@ void PacketReader::getLabelFromContent(const vector<uint8_t>& content, uint16_t&
       uint16_t offset=256*(labellen & ~0xc0) + (unsigned int)content.at(frompos++) - sizeof(dnsheader);
       //        cout<<"This is an offset, need to go to: "<<offset<<endl;
 
-      if(offset >= pos-2)
+      if(offset >= pos)
         throw MOADNSException("forward reference during label decompression");
       return getLabelFromContent(content, offset, ret, ++recurs);
     }

Original file line number	Diff line number	Diff line change
`@@ -471,7 +471,7 @@ void PacketReader::getLabelFromContent(const vector<uint8_t>& content, uint16_t&`
`471`	`471`	`uint16_t offset=256*(labellen & ~0xc0) + (unsigned int)content.at(frompos++) - sizeof(dnsheader);`
`472`	`472`	`// cout<<"This is an offset, need to go to: "<<offset<<endl;`
`473`	`473`
`474`		`- if(offset >= pos-2)`
	`474`	`+ if(offset >= pos)`
`475`	`475`	`throw MOADNSException("forward reference during label decompression");`
`476`	`476`	`return getLabelFromContent(content, offset, ret, ++recurs);`
`477`	`477`	`}`