prevent issue with 0 callDstId on dvmpatch; reject TDUs with no destination (these are invalid and can fuck off);

src/fne/network/callhandler/TagP25Data.cpp

@@ -218,11 +218,17 @@ bool TagP25Data::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
         if (duid != DUID::TSDU && duid != DUID::PDU) {
             // is this the end of the call stream?
             if ((duid == DUID::TDU) || (duid == DUID::TDULC)) {
+                // reject TDU with no source or destination
                 if (srcId == 0U && dstId == 0U) {
                     LogWarning(LOG_NET, "P25, invalid TDU, peer = %u, ssrc = %u, srcId = %u, dstId = %u, streamId = %u, fromUpstream = %u", peerId, ssrc, srcId, dstId, streamId, fromUpstream);
                     return false;
                 }
 
+                // reject TDU's with no destination
+                if (dstId == 0U) {
+                    return false;
+                }
+
                 RxStatus status = m_status[dstId];
                 uint64_t duration = hrc::diff(pktTime, status.callStartTime);
 

src/patch/HostPatch.cpp

@@ -1635,6 +1635,28 @@ void HostPatch::resetP25Call(uint32_t srcId)
     using namespace p25::defines;
     using namespace p25::dfsi::defines;
 
+    if (m_callDstId == 0U) {
+        LogWarning(LOG_HOST, "P25, resetP25Call(), callDstId is zero, cannot send TDU");
+
+        m_rxStartTime = 0U;
+        m_rxStreamId = 0U;
+
+        m_callInProgress = false;
+        m_callAlgoId = ALGO_UNENCRYPT;
+        m_rxStartTime = 0U;
+        m_rxStreamId = 0U;
+
+        m_p25SrcCrypto->clearMI();
+        m_p25SrcCrypto->resetKeystream();
+        m_p25DstCrypto->clearMI();
+        m_p25DstCrypto->resetKeystream();
+
+        m_callDropTime.stop();
+
+        m_network->resetP25();
+        return;
+    }
+
     p25::lc::LC lc = p25::lc::LC();
     lc.setLCO(P25DEF::LCO::GROUP);
     lc.setDstId(m_callDstId);
@@ -1670,6 +1692,8 @@ void HostPatch::resetP25Call(uint32_t srcId)
     m_rxStartTime = 0U;
     m_rxStreamId = 0U;
 
+    m_callDstId = 0U;
+
     m_p25SrcCrypto->clearMI();
     m_p25SrcCrypto->resetKeystream();
     m_p25DstCrypto->clearMI();