From 5ba2f67afb02c5302b2898949ed6fc3b3d37dcf1 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Fri, 10 Oct 2008 21:16:12 -0700 Subject: [PATCH] security: avoid calling a NULL function pointer in drivers/video/tvaudio.c NULL function pointers are very bad security wise. This one got caught by kerneloops.org quite a few times, so it's happening in the field.... Fix is simple, check the function pointer for NULL, like 6 other places in the same function are already doing. Signed-off-by: Arjan van de Ven Signed-off-by: Linus Torvalds --- drivers/media/video/tvaudio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/video/tvaudio.c b/drivers/media/video/tvaudio.c index 463680b13289..b59e47272abf 100644 --- a/drivers/media/video/tvaudio.c +++ b/drivers/media/video/tvaudio.c @@ -1792,7 +1792,7 @@ static int chip_command(struct i2c_client *client, break; case VIDIOC_S_FREQUENCY: chip->mode = 0; /* automatic */ - if (desc->checkmode) { + if (desc->checkmode && desc->setmode) { desc->setmode(chip,V4L2_TUNER_MODE_MONO); if (chip->prevmode != V4L2_TUNER_MODE_MONO) chip->prevmode = -1; /* reset previous mode */ -- 2.20.1