From: Arjan van de Ven Date: Sat, 11 Oct 2008 04:16:12 +0000 (-0700) Subject: security: avoid calling a NULL function pointer in drivers/video/tvaudio.c X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=5ba2f67afb02c5302b2898949ed6fc3b3d37dcf1;p=openwrt%2Fstaging%2Fblogic.git 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 --- 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 */