Networking: Any linger UDP read-ahead buffers must be freed when UDP socket is closed

net/udp/udp_conn.c

@@ -60,6 +60,7 @@
 
 #include "devif/devif.h"
 #include "netdev/netdev.h"
+#include "iob/iob.h"
 #include "udp/udp.h"
 
 /****************************************************************************
@@ -489,6 +490,12 @@ void udp_free(FAR struct udp_conn_s *conn)
 
   dq_rem(&conn->node, &g_active_udp_connections);
 
+#ifdef CONFIG_NET_UDP_READAHEAD
+  /* Release any read-ahead buffers attached to the connection */
+
+  iob_free_queue(&conn->readahead);
+#endif
+
   /* Free the connection */
 
   dq_addlast(&conn->node, &g_free_udp_connections);