From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Zhang Shurong <zhang_shurong@foxmail.com>
Cc: victor.liu@nxp.com, andrzej.hajda@intel.com,
neil.armstrong@linaro.org, rfoss@kernel.org, jonas@kwiboo.se,
jernej.skrabec@gmail.com, airlied@gmail.com, daniel@ffwll.ch,
shawnguo@kernel.org, s.hauer@pengutronix.de,
kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
dri-devel@lists.freedesktop.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm/bridge: imx: fix potential NULL pointer dereference in imx8qxp_ldb_parse_dt_companion()
Date: Mon, 28 Aug 2023 20:28:22 +0300 [thread overview]
Message-ID: <20230828172822.GE14596@pendragon.ideasonboard.com> (raw)
In-Reply-To: <tencent_026E4B04ACDCE341411EF54862F8C6AB1605@qq.com>
Hi Zhang,
Thank you for the patch.
On Tue, Aug 29, 2023 at 12:55:01AM +0800, Zhang Shurong wrote:
> of_match_device() may fail and returns a NULL pointer.
How can it return a NULL pointer here ?
> Fix this by checking the return value of of_match_device().
>
> Fixes: 3818715f62b4 ("drm/bridge: imx: Add LDB support for i.MX8qxp")
> Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
> ---
> drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
> index 7984da9c0a35..d272f35c8eac 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
> @@ -488,6 +488,8 @@ static int imx8qxp_ldb_parse_dt_companion(struct imx8qxp_ldb *imx8qxp_ldb)
> * string.
> */
> match = of_match_device(dev->driver->of_match_table, dev);
> + if (!match)
> + return -ENODEV;
> if (!of_device_is_compatible(companion, match->compatible)) {
> DRM_DEV_ERROR(dev, "companion LDB is incompatible\n");
> ret = -ENXIO;
--
Regards,
Laurent Pinchart
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next prev parent reply other threads:[~2023-08-28 17:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-28 16:55 [PATCH] drm/bridge: imx: fix potential NULL pointer dereference in imx8qxp_ldb_parse_dt_companion() Zhang Shurong
2023-08-28 17:28 ` Laurent Pinchart [this message]
2023-08-28 18:01 ` Zhang Shurong
2023-08-28 18:37 ` Laurent Pinchart
2023-08-29 2:28 ` Ying Liu
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