Seems like port->cad is NULL for unused ports
Signed-off-by: Konstantin Khlebnikov <khlebni...@openvz.org>
Cc: Rodolfo Giometti <giome...@enneenne.com>
---
[ 0.151192] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 0.151759] IP: [<ffffffffa2de3048>] parport_detach+0x24/0x95 [pps_parport]
[ 0.153875] Process rmmod (pid: 22117, threadinfo ffff880061174000, task
ffff8800613db000)
[ 0.153875] Call Trace:
[ 0.153875] [<ffffffffa064c49c>] parport_unregister_driver+0x51/0x8b
[parport]
[ 0.153875] [<ffffffffa2de364f>] pps_parport_exit+0x17/0x20 [pps_parport]
[ 0.153875] [<ffffffff8110e976>] sys_delete_module+0x328/0x3d2
[ 0.153875] [<ffffffff8168e7e8>] tracesys+0xe1/0xe6
---
drivers/pps/clients/pps_parport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pps/clients/pps_parport.c
b/drivers/pps/clients/pps_parport.c
index e1b4705..7e9bcd4 100644
--- a/drivers/pps/clients/pps_parport.c
+++ b/drivers/pps/clients/pps_parport.c
@@ -194,7 +194,7 @@ static void parport_detach(struct parport *port)
struct pps_client_pp *device;
/* FIXME: oooh, this is ugly! */
- if (strcmp(pardev->name, KBUILD_MODNAME))
+ if (!pardev || strcmp(pardev->name, KBUILD_MODNAME))
/* not our port */
return;
--
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