Merge pull request #2172 from cesanta/null_mip

Check for calloc() failure in MIP

src/tcpip/tcpip.c

@@ -470,6 +470,10 @@ static void settmout(struct mg_connection *c, uint8_t type) {
 static struct mg_connection *accept_conn(struct mg_connection *lsn,
                                          struct pkt *pkt) {
   struct mg_connection *c = mg_alloc_conn(lsn->mgr);
+  if (c == NULL) {
+    MG_ERROR(("OOM"));
+    return NULL;
+  }
   struct connstate *s = (struct connstate *) (c + 1);
   s->seq = mg_ntohl(pkt->tcp->ack), s->ack = mg_ntohl(pkt->tcp->seq);
   memcpy(s->mac, pkt->eth->src, sizeof(s->mac));
@@ -829,6 +833,7 @@ void mg_tcpip_init(struct mg_mgr *mgr, struct mg_tcpip_if *ifp) {
     mg_random(&ifp->eport, sizeof(ifp->eport));   // Random from 0 to 65535
     ifp->eport |=
         MG_EPHEMERAL_PORT_BASE;  // Random from MG_EPHEMERAL_PORT_BASE to 65535
+    if (ifp->tx.ptr == NULL || ifp->recv_queue.buf == NULL) MG_ERROR(("OOM"));
   }
 }