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Avoid bad downcast

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This commit is contained in:
dmiller 2026-04-22 16:13:07 +00:00
parent 36f0b76bdb
commit c3140c4799
1 changed files with 8 additions and 5 deletions
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13
libnetutil/PacketParser.cc
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@ -1710,18 +1710,21 @@ bool PacketParser::is_response(PacketElement *sent, PacketElement *rcvd){
/* So far we've verified that the ICMP error contains an IP datagram that matches
* what we sent. Now, let's find the upper layer protocol (skip extension
* headers and the like until we find some transport protocol). */
TransportLayerElement *layer4error=(TransportLayerElement *)iperror->getNextElement();
while(layer4error!=NULL){
if(layer4error->protocol_id()==HEADER_TYPE_UDP || layer4error->protocol_id()==HEADER_TYPE_TCP ){
iperror = dynamic_cast<NetworkLayerElement *>(iperror->getNextElement());
while(iperror!=NULL){
if(iperror->protocol_id()==HEADER_TYPE_UDP || iperror->protocol_id()==HEADER_TYPE_TCP ){
break;
}else{
layer4error=(TransportLayerElement *)layer4error->getNextElement();
iperror = dynamic_cast<NetworkLayerElement *>(iperror->getNextElement());
}
}
if(layer4error==NULL)
if(iperror==NULL)
return false;
/* Now make sure we see the same port numbers */
TransportLayerElement *layer4error = dynamic_cast<TransportLayerElement *>(iperror);
if (layer4error == NULL)
return false;
if( layer4error->getSourcePort() != ((TransportLayerElement *)sent_layer4)->getSourcePort() )
return false;
if( layer4error->getDestinationPort() != ((TransportLayerElement *)sent_layer4)->getDestinationPort() )