V4L/DVB (13576): ir-common: fix an oops caused by the usage of an initialized drvdata
As reported by Sander Eikelenboom <linux@eikelemboon.it>:
> Tried to update my v4l-dvb modules today, but got a bug with my pinnacle
> card, seems to be related to the recent changes in the ir code.
>
> Dec 5 23:30:25 security kernel: [ 5.735698] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> Dec 5 23:30:25 security kernel: [ 5.735716] IP: [<ffffffffa00997be>] :ir_common:ir_input_free+0x26/0x3e
Thanks-to: Sander Eikelenboom <linux@eikelemboon.it> for reporting and testing the fix.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/common/ir-keytable.c b/drivers/media/common/ir-keytable.c
index 26ce5bc..ceef0e8 100644
--- a/drivers/media/common/ir-keytable.c
+++ b/drivers/media/common/ir-keytable.c
@@ -419,6 +419,9 @@
{
struct ir_scancode_table *rc_tab = input_get_drvdata(dev);
+ if (!rc_tab)
+ return;
+
IR_dprintk(1, "Freed keycode table\n");
rc_tab->size = 0;