linux-kernel - Re: media: staging/imx: Improve pipeline searching (bug report)

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Date:   Wed, 26 Jun 2019 11:35:38 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Colin Ian King <colin.king@...onical.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: media: staging/imx: Improve pipeline searching (bug report)

Thanks for catching,

On 6/26/19 11:27 AM, Colin Ian King wrote:
> Hi,
>
> Static analysis with Coverity on Linux next has found a potential issue
> with the following commit:
>
> commit 3ef46bc97ca2c918b7657a08220c7340a9bb07a2
> Author: Steve Longerbeam <slongerbeam@...il.com>
> Date:   Fri May 10 17:50:11 2019 -0400
>
>      media: staging/imx: Improve pipeline searching
>
>
> The issue is in drivers/staging/media/imx/imx-media-utils.c in function
> find_pipeline_entity:
>
>          struct media_pad *pad = NULL;
>
> pad is assigned a NULL
>
>          struct video_device *vfd;
>          struct v4l2_subdev *sd;
>
>          if (grp_id && is_media_entity_v4l2_subdev(start)) {
>                  sd = media_entity_to_v4l2_subdev(start);
>                  if (sd->grp_id & grp_id)
>                          return &sd->entity;
>          } else if (buftype && is_media_entity_v4l2_video_device(start)) {
>                  vfd = media_entity_to_video_device(pad->entity);
>
> ..and above the null pad is being dereferenced causing a kernel oops.

yes, this is a typo and should be:

vfd = media_entity_to_video_device(start);


Sending a patch...

Steve