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 <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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 */