linux-kernel - Re: [PATCH] drm/msm/mdp5: Fix mdp5_cfg

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Message-ID: <20190501165115.GH2938@tuxbook-pro>
Date:   Wed, 1 May 2019 09:51:15 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     robdclark@...il.com, sean@...rly.run, airlied@...ux.ie,
        daniel@...ll.ch, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/mdp5: Fix mdp5_cfg_init error return

On Wed 01 May 09:14 PDT 2019, Jeffrey Hugo wrote:

> If mdp5_cfg_init fails because of an unknown major version, a null pointer
> dereference occurs.  This is because the caller of init expects error
> pointers, but init returns NULL on error.  Fix this by returning the
> expected values on error.
> 
> Fixes: 2e362e1772b8 (drm/msm/mdp5: introduce mdp5_cfg module)

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> ---
>  drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c
> index ea8f7d7daf7f..52e23780fce1 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c
> @@ -721,7 +721,7 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
>  	if (cfg_handler)
>  		mdp5_cfg_destroy(cfg_handler);
>  
> -	return NULL;
> +	return ERR_PTR(ret);
>  }
>  
>  static struct mdp5_cfg_platform *mdp5_get_config(struct platform_device *dev)
> -- 
> 2.17.1
>