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[media] s5k6aa: Fix possible NULL pointer dereference 

Make sure __s5k6aa_get_crop_rect() always returns valid pointer,
as it is assumed at the callers.
crop->which is already validated when subdev set_crop and get_crop
callbacks are called from within the v4l2-core. If it ever happens
the crop operations are called directly for some reason in kernel
space, with incorrect crop->which argument, just log it with WARN
and return reference to the TRY crop.

Reported-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki 2012-09-26 05:45:21 -03:00 committed by Mauro Carvalho Chehab
parent 7fb89eca0f
commit 94c15b5e67
1 changed files with 4 additions and 7 deletions
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11
drivers/media/i2c/s5k6aa.c
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@ -1061,10 +1061,9 @@ __s5k6aa_get_crop_rect(struct s5k6aa *s5k6aa, struct v4l2_subdev_fh *fh,
{
if (which == V4L2_SUBDEV_FORMAT_ACTIVE)
return &s5k6aa->ccd_rect;
if (which == V4L2_SUBDEV_FORMAT_TRY)
return v4l2_subdev_get_try_crop(fh, 0);
return NULL;
WARN_ON(which != V4L2_SUBDEV_FORMAT_TRY);
return v4l2_subdev_get_try_crop(fh, 0);
}
static void s5k6aa_try_format(struct s5k6aa *s5k6aa,
@ -1169,12 +1168,10 @@ static int s5k6aa_get_crop(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
struct v4l2_rect *rect;
memset(crop->reserved, 0, sizeof(crop->reserved));
mutex_lock(&s5k6aa->lock);
rect = __s5k6aa_get_crop_rect(s5k6aa, fh, crop->which);
if (rect)
crop->rect = *rect;
crop->rect = *rect;
mutex_unlock(&s5k6aa->lock);
v4l2_dbg(1, debug, sd, "Current crop rectangle: (%d,%d)/%dx%d\n",