hostapd-2.4: add support to compile hostapd for ccimx6ul

https://jira.digi.com/browse/DEL-2654

Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>

meta-digi-dey/recipes-connectivity/hostapd/hostapd-2.4/ccimx6ul/fix_num_probereq_cb_clearing.patch

@@ -0,0 +1,38 @@
+From 24fd20438f00a6f1bdeb6f23358ef60c2696b488 Mon Sep 17 00:00:00 2001
+From: "Chen, Yi" <yichen@qti.qualcomm.com>
+Date: Wed, 2 Sep 2015 21:25:01 +0530
+Subject: WPS: Fix num_probereq_cb clearing on DISABLE to avoid segfault
+
+Reset hapd->num_probereq_cb to 0 on an interface deinit to avoid
+unexpected behavior if the same interface is enabled again without fully
+freeing the data structures. hostapd_register_probereq_cb() increments
+hapd->num_probereq_cb by one and leaves all old values unchanged. In
+this deinit+init case, that would result in the first entry in the list
+having an uninitialized pointer and the next Probe Request frame
+processing would likely cause the process to terminate on segmentation
+fault.
+
+This issue could be hit when hostapd was used with WPS enabled (non-zero
+wps_state configuration parameter) and control interface command DISABLE
+and ENABLE were used.
+
+Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
+---
+ src/ap/hostapd.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
+index e4d7bfc..c09c17a 100644
+--- a/src/ap/hostapd.c
++++ b/src/ap/hostapd.c
+@@ -261,6 +261,7 @@ static void hostapd_free_hapd_data(struct hostapd_data *hapd)
+ {
+ 	os_free(hapd->probereq_cb);
+ 	hapd->probereq_cb = NULL;
++	hapd->num_probereq_cb = 0;
+ 
+ #ifdef CONFIG_P2P
+ 	wpabuf_free(hapd->p2p_beacon_ie);
+-- 
+cgit v0.12
+

meta-digi-dey/recipes-connectivity/hostapd/hostapd_2.4.bbappend

@@ -0,0 +1,9 @@
+# Copyright (C) 2016 Digi International.
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BP}:"
+
+# The recipe uses a different "$S" directory so point the patch to the hostapd
+# tarball directory.
+SRC_URI_append_ccimx6ul = " file://fix_num_probereq_cb_clearing.patch;patchdir=.."
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"