the stack overflow issue was related to a not correctly initialized external variable (size). Use a ternery to prevent to large size values.

src/udp_socket.c

@@ -51,12 +51,11 @@ static
 TR_RemoteData
 udpSocketRecv(TR_Socket this, size_t size)
 {
-	unsigned char * buffer = TR_malloc(size);
+	unsigned char buffer[size>8192 ? 8192 : size];
 	ssize_t       received;
 	TR_RemoteData rdata;
-	TR_Socket     remote;
+	TR_Socket     remote = TR_new(TR_UdpSocket, this->log, NULL, 0, 0);
 	
-	remote = TR_new(TR_UdpSocket, this->log, NULL, 0, 0);
 	remote->addrlen = this->addrlen;
 
 	received = recvfrom(
@@ -73,8 +72,6 @@ udpSocketRecv(TR_Socket this, size_t size)
 		rdata = TR_new(TR_RemoteData, buffer, received, remote);
 	}
 
-	TR_MEM_FREE(buffer);
-
 	rdata->free_remote = 1;
 
 	return rdata;