[FS#3319] erratic behaviour wireless network control on system with three wireless phy

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - william wortel (wwortel) 

Attached to Project - OpenWrt/LEDE Project
Summary - erratic behaviour wireless network control on system with three wireless phy
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device: Ubiquiti Routerstation (ar71xx)
Software: OpenWrt SNAPSHOT, r14382+7-ad0f0df909 (local compilation after Sep 3 2020 git pull)
Symptoms: commands like 'wifi up wlan1' on a system with wlan0, wlan1, and wlan2 (phy0,1,2) , make other wlanN disapperar than wlan1.
plus in dmesg messages like
[ n.n] do_page_fault(): sending SIGSEGV to hostapd for invalid write access to 00000000
[ n.n] epc = 77e79e6c in libc.so[77e4c000+9c000]
[ n.s] ra  = 77e1e309 in libubus.so[77e1c000+13000] 

Bug found through experimentation:
script: /lib/netifd/wireless/mac80211.sh
function: drv_mac80211_teardown()
line: json_select data
problem: 'data' does not produce phy, 'config' does.
corrected line: json_select config

Going though experimentations also found that there may be problems in
script: /lib/netifd/hostapd.sh
function: wpa_supplicant_run()
line: ubus call wpa_supplicant config_add 
and the lines that follow with parameters and line continuations.
Replaced:
	ubus call wpa_supplicant config_add "{ \
		\"driver\": \"${_w_driver:-wext}\", \"ctrl\": \"$_rpath\", \
		\"iface\": \"$ifname\", \"config\": \"$_config\" \
		${network_bridge:+, \"bridge\": \"$network_bridge\"} \
		${hostapd_ctrl:+, \"hostapd_ctrl\": \"$hostapd_ctrl\"} \
		}"
By:
	local br=${network_bridge:+',"bridge":"'$network_bridge'"'}
	local hc=${hostapd_ctrl:+',"hostapd_ctrl":"'$hostapd_ctrl'"'}
	local jsonstr='{"driver":"'${_w_driver:-wext}'","iface":"'${ifname}'"'${br}${hc}',"ctrl":"'${_rpath}'","config":"'${_config}'"}'
	ubus call wpa_supplicant config_add ${jsonstr}
	
because in a separate test script just to see the workings of the original I could not get it to work due to the nested parameter substitution.
Have removed all the \" as the " do not need to be escaped when within single quotes.

 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3319

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