From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: linux-media@vger.kernel.org
Cc: Bingbu Cao <bingbu.cao@intel.com>,
Tianshu Qiu <tian.shu.qiu@intel.com>,
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Subject: [PATCH 1/1] ipu3-imgu: Fix NULL pointer dereference in active selection access
Date: Thu, 25 Aug 2022 22:03:51 +0300 [thread overview]
Message-ID: <20220825190351.3241444-1-sakari.ailus@linux.intel.com> (raw)
What the IMGU driver did was that it first acquired the pointers to active
and try V4L2 subdev state, and only then figured out which one to use.
The problem with that approach and a later patch (see Fixes: tag) is that
as sd_state argument to v4l2_subdev_get_try_crop() et al is NULL, there is
now an attempt to dereference that.
Fix this.
Also rewrap lines a little.
Fixes: 0d346d2a6f54 ("media: v4l2-subdev: add subdev-wide state struct")
Cc: stable@vger.kernel.org # for v5.14 and later
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
drivers/staging/media/ipu3/ipu3-v4l2.c | 31 ++++++++++++--------------
1 file changed, 14 insertions(+), 17 deletions(-)
diff --git a/drivers/staging/media/ipu3/ipu3-v4l2.c b/drivers/staging/media/ipu3/ipu3-v4l2.c
index d1c539cefba87..2234bb8d48b34 100644
--- a/drivers/staging/media/ipu3/ipu3-v4l2.c
+++ b/drivers/staging/media/ipu3/ipu3-v4l2.c
@@ -192,33 +192,30 @@ static int imgu_subdev_get_selection(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
- struct v4l2_rect *try_sel, *r;
- struct imgu_v4l2_subdev *imgu_sd = container_of(sd,
- struct imgu_v4l2_subdev,
- subdev);
+ struct imgu_v4l2_subdev *imgu_sd =
+ container_of(sd, struct imgu_v4l2_subdev, subdev);
if (sel->pad != IMGU_NODE_IN)
return -EINVAL;
switch (sel->target) {
case V4L2_SEL_TGT_CROP:
- try_sel = v4l2_subdev_get_try_crop(sd, sd_state, sel->pad);
- r = &imgu_sd->rect.eff;
- break;
+ if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
+ sel->r = *v4l2_subdev_get_try_crop(sd, sd_state,
+ sel->pad);
+ else
+ sel->r = imgu_sd->rect.eff;
+ return 0;
case V4L2_SEL_TGT_COMPOSE:
- try_sel = v4l2_subdev_get_try_compose(sd, sd_state, sel->pad);
- r = &imgu_sd->rect.bds;
- break;
+ if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
+ sel->r = *v4l2_subdev_get_try_compose(sd, sd_state,
+ sel->pad);
+ else
+ sel->r = imgu_sd->rect.bds;
+ return 0;
default:
return -EINVAL;
}
-
- if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
- sel->r = *try_sel;
- else
- sel->r = *r;
-
- return 0;
}
static int imgu_subdev_set_selection(struct v4l2_subdev *sd,
--
2.30.2
next reply other threads:[~2022-08-25 19:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-25 19:03 Sakari Ailus [this message]
2022-08-26 10:40 ` [PATCH 1/1] ipu3-imgu: Fix NULL pointer dereference in active selection access Bingbu Cao
2022-09-07 13:44 ` Maximilian Luz
2022-09-07 19:09 ` Laurent Pinchart
2022-09-07 21:29 ` Maximilian Luz
2022-09-07 20:01 ` Sakari Ailus
2022-09-07 21:26 ` Maximilian Luz
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