Backport fix for possible memleak when receiving zero size UDP packets.

espressif/arduino-esp32#1672
everslick · Sep 15, 2021 · 7313df6 · 7313df6
1 parent 2c348e2
commit 7313df6
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/libraries/WiFi/src/WiFiUdp.cpp b/libraries/WiFi/src/WiFiUdp.cpp
@@ -221,8 +221,10 @@ int WiFiUDP::parsePacket(){
   }
   remote_ip = IPAddress(si_other.sin_addr.s_addr);
   remote_port = ntohs(si_other.sin_port);
-  rx_buffer = new cbuf(len);
-  rx_buffer->write(buf, len);
+  if (len > 0) {
+    rx_buffer = new cbuf(len);
+    rx_buffer->write(buf, len);
+  }
   delete[] buf;
   return len;
 }