Messages in this thread | | | From | Janusz Krzysztofik <> | Subject | Re: [PATCH 03/14] media: ov6650: Fix unverified arguments used in .set_fmt() | Date | Wed, 08 May 2019 01:33:19 +0200 |
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Hi Sakari,
Sorry for late answer, I've just found your message in Gmail spam folder.
On Tuesday, April 30, 2019 3:58:09 PM CEST Sakari Ailus wrote: > Hi Janusz, > > On Mon, Apr 08, 2019 at 11:42:31PM +0200, Janusz Krzysztofik wrote: > > Commit 717fd5b4907ad ("[media] v4l2: replace try_mbus_fmt by set_fmt") > > converted a former ov6650_try_fmt() video operation callback to an > > ov6650_set_fmt() pad operation callback. However, the function does not > > verify correctness of user provided format->which flag and pad config > > pointer arguments. Fix it. > > > > Fixes: 717fd5b4907ad ("[media] v4l2: replace try_mbus_fmt by set_fmt") > > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com> > > Cc: stable@vger.kernel.org > > --- > > drivers/media/i2c/ov6650.c | 11 +++++++++++ > > 1 file changed, 11 insertions(+) > > > > diff --git a/drivers/media/i2c/ov6650.c b/drivers/media/i2c/ov6650.c > > index 007f0ca24913..3062c9a6c57b 100644 > > --- a/drivers/media/i2c/ov6650.c > > +++ b/drivers/media/i2c/ov6650.c > > @@ -679,6 +679,17 @@ static int ov6650_set_fmt(struct v4l2_subdev *sd, > > if (format->pad) > > return -EINVAL; > > > > + switch (format->which) { > > + case V4L2_SUBDEV_FORMAT_ACTIVE: > > + break; > > + case V4L2_SUBDEV_FORMAT_TRY: > > + if (cfg) > > + break; > > + /* fall through */ > > + default: > > + return -EINVAL; > > + } > > For this to return an error, there would need to be a problem on the > caller's side. In other words, this isn't supposed to happen.
How about raising a bug if that happens nevertheless?
@@ -677,10 +677,20 @@ static int ov6650_set_fmt(struct v4l2_subdev *sd, struct ov6650 *priv = to_ov6650(client);
if (format->pad) return -EINVAL; + switch (format->which) { + case V4L2_SUBDEV_FORMAT_TRY: + BUG_ON(!cfg); + /* fall through */ + case V4L2_SUBDEV_FORMAT_ACTIVE: + break; + default: + BUG(); + } + if (is_unscaled_ok(mf->width, mf->height, &priv->rect)) v4l_bound_align_image(&mf->width, 2, W_CIF, 1, &mf->height, 2, H_CIF, 1, 0); mf->field = V4L2_FIELD_NONE;
Thanks, Janusz
> > Instead of adding such checks to all drivers, I think they instead should > be added to the caller's side. The checks already exist for uAPI, but not > for other drivers. > > The same applies to patches until 7th (including). > > > + > > if (is_unscaled_ok(mf->width, mf->height, &priv->rect)) > > v4l_bound_align_image(&mf->width, 2, W_CIF, 1, > > &mf->height, 2, H_CIF, 1, 0); > >
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