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authorArjan van de Ven <arjan@linux.intel.com>2008-10-10 21:16:12 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-22 14:05:18 -0700
commit6d3c6d8e4e1160df23405b45b6b5b01f5b91bcb1 (patch)
treeb0777f4e77fcf04777359bfec9f24d32d14a3f6b
parentfd8ceb79314d7ff2c580b4ac4db716134c647641 (diff)
security: avoid calling a NULL function pointer in drivers/video/tvaudio.c
commit 5ba2f67afb02c5302b2898949ed6fc3b3d37dcf1 upstream 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/media/video/tvaudio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/video/tvaudio.c b/drivers/media/video/tvaudio.c
index 01ebcec040c4..db55c5c6d208 100644
--- a/drivers/media/video/tvaudio.c
+++ b/drivers/media/video/tvaudio.c
@@ -1804,7 +1804,7 @@ 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 */