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

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Message-ID: <9b6d7f0e-f191-e5d5-e20b-9244800678fe@canonical.com>
Date:   Wed, 26 Jun 2019 19:27:51 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Steve Longerbeam <slongerbeam@...il.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)

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.

                if (buftype == vfd->queue->type)
                        return &vfd->entity;
        }


Colin