net/hostapd: Fix uninitialized packet pointer on error

The packet pointer (called packet) will remain uninitialized when
pcap_next_ex() returns an error. This occurs when the wlan
interface is shut down using ifconfig destroy. Adding a NULL
assignment to packet duplicates what pcap_next() does.

The reason we use pcap_next_ex() in this instance is because with
pacp_next() when we receive a null pointer if there was an error
or if no packets were read. With pcap_next_ex() we can differentiate
between an error and legitimately no packets were received.

PR:             270649, 273696
Obtained from:	src 953efa5b200f
Reported by:    Robert Morris <rtm@lcs.mit.edu>
MFH:		2023Q3

net/hostapd/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	hostapd
 PORTVERSION=	2.10
-PORTREVISION=	6
+PORTREVISION=	7
 CATEGORIES=	net
 MASTER_SITES=	https://w1.fi/releases/
 

net/hostapd/files/patch-src_l2__packet_l2__packet__freebsd.c

@@ -1,5 +1,5 @@
 --- src/l2_packet/l2_packet_freebsd.c.orig	2022-01-16 12:51:29.000000000 -0800
-+++ src/l2_packet/l2_packet_freebsd.c	2022-04-14 07:35:30.668820000 -0700
++++ src/l2_packet/l2_packet_freebsd.c	2023-09-11 22:00:09.826831000 -0700
 @@ -8,7 +8,10 @@
   */
 
@@ -12,7 +12,7 @@
  #include <net/bpf.h>
  #endif /* __APPLE__ */
  #include <pcap.h>
-@@ -76,24 +79,27 @@
+@@ -76,24 +79,28 @@
  {
  	struct l2_packet_data *l2 = eloop_ctx;
  	pcap_t *pcap = sock_ctx;
@@ -26,6 +26,7 @@
 -	packet = pcap_next(pcap, &hdr);
 +	if (pcap_next_ex(pcap, &hdr, &packet) == -1) {
 +		wpa_printf(MSG_ERROR, "Error reading packet, has device disappeared?");
++		packet = NULL;
 +		eloop_terminate();
 +	}