wireless-tools: Attempt to fix memory leak

We would leak all the results for all the scans. At some point in
time the kernel OOM would kick-in and kill the process. Enable
building with -ggdb3 for debug symbols and remmeber the old list
head so we can free it.

==32240== 756 bytes in 3 blocks are definitely lost in loss record 7 of 8
==32240==    at 0x40291CC: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==32240==    by 0x804BCF5: iw_process_scanning_token (iwlib.c:3059)
==32240==    by 0x804BCF5: iw_process_scan (iwlib.c:3255)
==32240==    by 0x804BEAF: iw_scan (iwlib.c:3310)
==32240==    by 0x8048FD8: scan_wifi (wifi2udp.c:72)
==32240==    by 0x8048DB2: main (wifi2udp.c:143)

recipes-fixes/wireless-tools/files/0001-Add-wifi2udp-program.patch

@@ -10,11 +10,11 @@ Subject: [PATCH 1/1] Add wifi2udp program
  2 files changed, 149 insertions(+), 1 deletion(-)
  create mode 100644 wifi2udp.c
 
-Index: wireless_tools.29/Makefile
+Index: wireless_tools.30/Makefile
 ===================================================================
---- wireless_tools.29.orig/Makefile	2014-09-08 17:27:45.000000000 +0200
-+++ wireless_tools.29/Makefile	2014-09-08 17:32:52.065211007 +0200
-@@ -48,7 +48,7 @@
+--- wireless_tools.30.orig/Makefile
++++ wireless_tools.30/Makefile
+@@ -50,7 +50,7 @@ WEXT_HEADER = wireless.$(WE_VERSION).h
  # Targets to build
  STATIC=libiw.a
  DYNAMIC=libiw.so.$(WT_VERSION)
@@ -23,7 +23,16 @@ Index: wireless_tools.29/Makefile
  MANPAGES8=iwconfig.8 iwlist.8 iwpriv.8 iwspy.8 iwgetid.8 iwevent.8 ifrename.8
  MANPAGES7=wireless.7
  MANPAGES5=iftab.5
-@@ -135,6 +135,8 @@
+@@ -105,7 +105,7 @@ endif
+ 
+ # Other flags
+ CFLAGS=-Os -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow \
+-	-Wpointer-arith -Wcast-qual -Winline -I.
++	-Wpointer-arith -Wcast-qual -Winline -I. -ggdb3
+ #CFLAGS=-O2 -W -Wall -Wstrict-prototypes -I.
+ DEPFLAGS=-MMD
+ XCFLAGS=$(CFLAGS) $(DEPFLAGS) $(WARN) $(HEADERS) $(WELIB_FLAG) $(WEDEF_FLAG)
+@@ -137,6 +137,8 @@ ifrename: ifrename.o $(IWLIB)
  
  macaddr: macaddr.o $(IWLIB)
  
@@ -32,11 +41,11 @@ Index: wireless_tools.29/Makefile
  iwmulticall: iwmulticall.o
  	$(CC) $(LDFLAGS) $(STRIPFLAGS) $(XCFLAGS) -o $@ $^ $(LIBS)
  
-Index: wireless_tools.29/wifi2udp.c
+Index: wireless_tools.30/wifi2udp.c
 ===================================================================
---- /dev/null	1970-01-01 00:00:00.000000000 +0000
-+++ wireless_tools.29/wifi2udp.c	2014-09-08 17:30:08.217211001 +0200
-@@ -0,0 +1,146 @@
+--- /dev/null
++++ wireless_tools.30/wifi2udp.c
+@@ -0,0 +1,149 @@
 +
 +#include <unistd.h>
 +#include <stdio.h>
@@ -122,6 +131,7 @@ Index: wireless_tools.29/wifi2udp.c
 +			char bssid[20];
 +			char line[1024];
 +			char essid_escaped[50];
++			wireless_scan *old_result;
 +			iw_sawap_ntop(&result->ap_addr, bssid);
 +
 +			escape_essid(result->b.essid, essid_escaped, 50);
@@ -131,7 +141,9 @@ Index: wireless_tools.29/wifi2udp.c
 +			rc = sendto(sock, line, strlen(line), 0, (struct sockaddr*)&remote, sizeof(remote));
 +			if (rc == -1)
 +				printf("Failed to send message: %s\n", strerror(errno));
++			old_result = result;
 +			result = result->next;
++			free(old_result);
 +		}
 +		sleep(delay);
 +	}

recipes-fixes/wireless-tools/wireless-tools_sysmocom.inc

@@ -1,7 +1,7 @@
 THISDIR := "${@os.path.dirname(bb.data.getVar('FILE', d, True))}"
 FILESPATH =. "${@base_set_filespath(["${THISDIR}/files"], d)}:"
 
-PRINC="6"
+PRINC="7"
 
 SRC_URI += "file://0001-Add-wifi2udp-program.patch \
 	    file://wifi2udp.service"