linux-kernel - RE: [PATCH] drm/fb-helper: Do the mode_set.connectors ZERO_SIZE_PTR check

Open Source and information security mailing list archives

Date:	Mon, 10 Mar 2014 02:11:43 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>,
	"airlied@...ux.ie" <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] drm/fb-helper: Do the mode_set.connectors ZERO_SIZE_PTR
 check

> Subject: Re: [PATCH] drm/fb-helper: Do the mode_set.connectors ZERO_SIZE_PTR
> check
> 
> On Thu, 06 Mar 2014, Xiubo Li <Li.Xiubo@...escale.com> wrote:
> > Since we cannot make sure the 'max_conn_count' will always be none
> > zero from the users, and then if max_conn_count equals to zero, the
> > kcalloc() will return ZERO_SIZE_PTR, which equals to ((void *)16).
> >
> > So this patch fix this via doing the zero pionter check of it.
> 
> Please just add a check for max_conn_count == 0 up front and handle it.
> 
> BR,
> Jani.
> 

Yes, that's one better choice.
See the next version please.

Thanks very much!

--
Best Regards,
Xiubo 

> 
> >
> > Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
> > ---
> >  drivers/gpu/drm/drm_fb_helper.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/drm_fb_helper.c
> b/drivers/gpu/drm/drm_fb_helper.c
> > index 3d13ca6e2..c6680ef 100644
> > --- a/drivers/gpu/drm/drm_fb_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_helper.c
> > @@ -536,7 +536,7 @@ int drm_fb_helper_init(struct drm_device *dev,
> >  				sizeof(struct drm_connector *),
> >  				GFP_KERNEL);
> >
> > -		if (!fb_helper->crtc_info[i].mode_set.connectors)
> > +		if (ZERO_OR_NULL_PTR(fb_helper->crtc_info[i].mode_set.connectors))
> >  			goto out_free;
> >  		fb_helper->crtc_info[i].mode_set.num_connectors = 0;
> >  	}
> > --
> > 1.8.4
> >
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> --
> Jani Nikula, Intel Open Source Technology Center
> 

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