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| author |   Sylwester Nawrocki <s.nawrocki@samsung.com> | 2012-09-26 05:45:21 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-10-02 14:01:30 -0300 |
| commit | 94c15b5e6755711af6dd81bde0f8396e24b75dc2 (patch) | |
| tree | 93a7da1e0a9c7ed2cca42374055e24f70b8e457b /drivers/media/i2c | |
| parent | [media] s5p-mfc: optimized code related to working contextes (diff) | |
| download | linux-dev-94c15b5e6755711af6dd81bde0f8396e24b75dc2.tar.xz linux-dev-94c15b5e6755711af6dd81bde0f8396e24b75dc2.zip | |
[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>
Diffstat (limited to 'drivers/media/i2c')
| -rw-r--r-- | drivers/media/i2c/s5k6aa.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/media/i2c/s5k6aa.c b/drivers/media/i2c/s5k6aa.c index 045ca7f4f6ca..57cd4fa0193d 100644 --- a/drivers/media/i2c/s5k6aa.c +++ b/drivers/media/i2c/s5k6aa.c @@ -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); + 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", |