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Message-ID: <85dd2c45-df99-4270-abeb-a3633afb9d6a@moroto.mountain>
Date: Sun, 9 Jun 2024 23:59:00 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Allen Chen <allen.chen@....com.tw>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Hermes Wu <hermes.wu@....com.tw>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: it6505: Fix potential NULL dereference
On Sun, Jun 09, 2024 at 10:38:39PM +0300, Dmitry Baryshkov wrote:
> On Sat, Jun 08, 2024 at 05:21:08PM +0300, Dan Carpenter wrote:
> > Smatch complains correctly that the NULL checking isn't consistent:
> >
> > drivers/gpu/drm/bridge/ite-it6505.c:2583 it6505_poweron()
> > error: we previously assumed 'pdata->pwr18' could be null
> > (see line 2569)
> >
> > Add a NULL check to prevent a NULL dereference on the error path.
> >
> > Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> > ---
> > drivers/gpu/drm/bridge/ite-it6505.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> > index 3f68c82888c2..4f01fadaec0f 100644
> > --- a/drivers/gpu/drm/bridge/ite-it6505.c
> > +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> > @@ -2580,7 +2580,8 @@ static int it6505_poweron(struct it6505 *it6505)
> > usleep_range(1000, 2000);
> > err = regulator_enable(pdata->ovdd);
> > if (err) {
> > - regulator_disable(pdata->pwr18);
> > + if (pdata->pwr18)
> > + regulator_disable(pdata->pwr18);
>
> Wait... I wat too quick to R-B it. The driver uses devm_regulator_get(),
> which always returns non-NULL result. So all `if (pdata->pwr18)` and
> `if (pdata->ovdd)` checks in the driver are useless. Could you please
> send a patch, removing them?
>
Sure. Will do.
regards,
dan carpenter
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