This bug was fixed in the package lightdm - 1.21.1-0ubuntu2
---------------
lightdm (1.21.1-0ubuntu2) zesty; urgency=medium
Restore patch from 1.20.0-0ubuntu3:
* Add debian/patches/terminate-session.patch: Terminate leftover processes
in greeter session. It can happen that the greeter session does not
properly clean up itself on logout. This causes leaked processes like
settings-daemon which act on the user session as they share the same
$DISPLAY. Ask logind to terminate remaining processes in the greeter
session on closing, which is more robust than trying to fix every greeter.
(LP: #1637758)
-- Martin Pitt <martin.p...@ubuntu.com> Tue, 22 Nov 2016 09:43:39
+0100
** Changed in: lightdm (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1643276
Title:
lightdm-gtk-greeter segv with unknown config options
Status in Light Display Manager:
Fix Released
Status in lightdm package in Ubuntu:
Fix Released
Bug description:
It seems that lightdm-gtk-greeter segfaults if you have an unknown
option in your configuration file.
Core was generated by `/usr/sbin/lightdm-gtk-greeter'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f0c4fd418a9 in config_load_from_file (config=0x2222100,
path=0x23127d0 "/etc/lightdm/lightdm.conf", messages=0x0, error=0x7fff572556b0)
at configuration.c:106
106 *messages = g_list_append (*messages,
g_strdup_printf (" [%s] contains unknown option %s", group, keys[j]));
[Current thread is 1 (Thread 0x7f0c51b189c0 (LWP 28281))]
(gdb) p group
$1 = (gchar *) 0x2265c10 "LightDM"
(gdb) p keys[j]
$2 = (gchar *) 0x21ecd00 "display-setup-script"
(gdb) p messages
$3 = (GList **) 0x0
(gdb) bt
#0 0x00007f0c4fd418a9 in config_load_from_file (config=0x2222100,
path=0x23127d0 "/etc/lightdm/lightdm.conf", messages=0x0, error=0x7fff572556b0)
at configuration.c:106
#1 0x00007f0c4fd41fe6 in config_load_from_standard_locations
(config=0x2222100, config_path=0x0, messages=0x0) at configuration.c:241
#2 0x00007f0c4fd3f029 in update_sessions () at session.c:234
#3 0x00007f0c4fd3f0f3 in lightdm_get_sessions () at session.c:269
#4 0x000000000040c972 in main ()
So it looks like a NULL message list arg is passed to config_load_from_file()
while the function expects non-NULL.
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