Jiri Slaby 368301f2fe pps: do not crash when failed to register ... With this command sequence: modprobe plip modprobe pps_parport rmmod pps_parport the partport_pps modules causes this crash: BUG: unable to handle kernel NULL pointer dereference at (null) IP: parport_detach+0x1d/0x60 [pps_parport] Oops: 0000 [#1] SMP ... Call Trace: parport_unregister_driver+0x65/0xc0 [parport] SyS_delete_module+0x187/0x210 The sequence that builds up to this is: 1) plip is loaded and takes the parport device for exclusive use: plip0: Parallel port at 0x378, using IRQ 7. 2) pps_parport then fails to grab the device: pps_parport: parallel port PPS client parport0: cannot grant exclusive access for device pps_parport pps_parport: couldn't register with parport0 3) rmmod of pps_parport is then killed because it tries to access pardev->name, but pardev (taken from port->cad) is NULL. So add a check for NULL in the test there too. Link: http://lkml.kernel.org/r/20160714115245.12651-1-jslaby@suse.cz Signed-off-by: Jiri Slaby <jslaby@suse.cz> Acked-by: Rodolfo Giometti <giometti@enneenne.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-07-23 10:25:54 +09:00
..
clients	pps: do not crash when failed to register	2016-07-23 10:25:54 +09:00
generators
kapi.c	ntp/pps: use y2038 safe types in pps_event_time	2015-10-01 09:59:16 -07:00
kc.c	ntp/pps: use y2038 safe types in pps_event_time	2015-10-01 09:59:16 -07:00
kc.h
Kconfig	pps: hide more configuration symbols behind CONFIG_PPS	2013-04-30 17:04:08 -07:00
Makefile
pps.c	PPS: convert class code to use dev_groups	2013-08-19 21:22:34 -07:00
sysfs.c	PPS: convert class code to use dev_groups	2013-08-19 21:22:34 -07:00