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Subject[PATCH] security: avoid calling a NULL function pointer in drivers/video/tvaudio.c

From: Arjan van de Ven <arjan@linux.intel.com>
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 <arjan@linux.intel.com>
---
drivers/media/video/tvaudio.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/tvaudio.c b/drivers/media/video/tvaudio.c
index 463680b..b59e472 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 */
--
1.5.5.1


--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org


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