linux-kernel - Re: [patch] drm: atmel-hlcdc: fix a NULL check

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Message-ID: <20160425111012.5e06978e@bbrezillon>
Date:	Mon, 25 Apr 2016 11:10:12 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] drm: atmel-hlcdc: fix a NULL check

On Mon, 25 Apr 2016 12:04:54 +0300
Dan Carpenter <dan.carpenter@...cle.com> wrote:

> If kmalloc() returned NULL we would end up dereferencing "state" a
> couple lines later.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Thanks,

Boris

> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> index 8df0aaf..867069b 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> @@ -415,8 +415,9 @@ atmel_hlcdc_crtc_duplicate_state(struct drm_crtc *crtc)
>  		return NULL;
>  
>  	state = kmalloc(sizeof(*state), GFP_KERNEL);
> -	if (state)
> -		__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
> +	if (!state)
> +		return NULL;
> +	__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
>  
>  	cur = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
>  	state->output_mode = cur->output_mode;



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com