linux-kernel - Re: [PATCH] drm: mali-dp: Add check for kzalloc

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Date:   Wed, 7 Dec 2022 10:00:12 +0000
From:   Liviu Dudau <liviu.dudau@....com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     brian.starkey@....com, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: mali-dp: Add check for kzalloc

On Wed, Dec 07, 2022 at 05:21:18PM +0800, Jiasheng Jiang wrote:
> As kzalloc may fail and return NULL pointer, it should be better to check
> the return value in order to avoid the NULL pointer dereference in
> __drm_atomic_helper_connector_reset.
> 
> Fixes: 8cbc5caf36ef ("drm: mali-dp: Add writeback connector")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>

Thanks for catching this!


Acked-by: Liviu Dudau <liviu.dudau@....com>

Best regards,
Liviu


> ---
>  drivers/gpu/drm/arm/malidp_mw.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
> index ef76d0e6ee2f..fe4474c2ddcf 100644
> --- a/drivers/gpu/drm/arm/malidp_mw.c
> +++ b/drivers/gpu/drm/arm/malidp_mw.c
> @@ -72,7 +72,11 @@ static void malidp_mw_connector_reset(struct drm_connector *connector)
>  		__drm_atomic_helper_connector_destroy_state(connector->state);
>  
>  	kfree(connector->state);
> -	__drm_atomic_helper_connector_reset(connector, &mw_state->base);
> +
> +	if (mw_state)
> +		__drm_atomic_helper_connector_reset(connector, &mw_state->base);
> +	else
> +		__drm_atomic_helper_connector_reset(connector, NULL);
>  }
>  
>  static enum drm_connector_status
> -- 
> 2.25.1
> 

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