linux-kernel - Re: [PATCH next] drm/sharp-memory: Fix some checks in sharp_memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <3c078224-071e-4dd9-bf8d-51dbd0f2a9b2@stanley.mountain>
Date: Fri, 25 Oct 2024 10:30:44 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Uwe Kleine-König <u.kleine-koenig@...libre.com>
Cc: Alex Lanzano <lanzano.alex@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Mehdi Djait <mehdi.djait@...tlin.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH next] drm/sharp-memory: Fix some checks in
 sharp_memory_probe()

On Thu, Oct 24, 2024 at 11:08:05PM +0200, Uwe Kleine-König wrote:
> On Wed, Oct 23, 2024 at 11:30:31AM +0300, Dan Carpenter wrote:
> > The devm_drm_dev_alloc() function returns error pointers, it never
> > returns NULL.  Change that check to IS_ERR().
> > 
> > The devm_gpiod_get_optional() function returns a mix of error pointers
> > if there is an error, or NULL if there is no GPIO assigned.  Add a check
> > for error pointers.
> > 
> > Fixes: b8f9f21716fe ("drm/tiny: Add driver for Sharp Memory LCD")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> > ---
> >  drivers/gpu/drm/tiny/sharp-memory.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/tiny/sharp-memory.c b/drivers/gpu/drm/tiny/sharp-memory.c
> > index 2d2315bd6aef..1bcdd79166a4 100644
> > --- a/drivers/gpu/drm/tiny/sharp-memory.c
> > +++ b/drivers/gpu/drm/tiny/sharp-memory.c
> > @@ -543,8 +543,8 @@ static int sharp_memory_probe(struct spi_device *spi)
> >  
> >  	smd = devm_drm_dev_alloc(dev, &sharp_memory_drm_driver,
> >  				 struct sharp_memory_device, drm);
> > -	if (!smd)
> > -		return -ENOMEM;
> > +	if (IS_ERR(smd))
> > +		return PTR_ERR(smd);
> >  
> >  	spi_set_drvdata(spi, smd);
> >  
> > @@ -555,6 +555,8 @@ static int sharp_memory_probe(struct spi_device *spi)
> >  		return dev_err_probe(dev, ret, "Failed to initialize drm config\n");
> >  
> >  	smd->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
> > +	if (IS_ERR(smd->enable_gpio))
> > +		return PTR_ERR(smd->enable_gpio);
> >  	if (!smd->enable_gpio)
> >  		dev_warn(dev, "Enable gpio not defined\n");
> 
> Use dev_err_probe() instead of plain returns?
> 

Sure.  Let me resend.

regards,
dan carpenter