linux-kernel - Re: [PATCH RESEND 2/3] drm/i915: check for return value

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Message-ID: <20151008142930.GC3383@phenom.ffwll.local>
Date:	Thu, 8 Oct 2015 16:29:31 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [PATCH RESEND 2/3] drm/i915: check for return value

On Thu, Oct 08, 2015 at 07:28:00PM +0530, Sudip Mukherjee wrote:
> We were not checking the return value of drm_encoder_init() which can
> fail. And if it fails then we will be working with an uninitialized
> encoder.
> 
> Cc: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>

Queued for -next, thanks for the patch.
-Daniel

> ---
> 
> Sent on 27/07/2015
> 
>  drivers/gpu/drm/i915/intel_dp.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 18bcfbe..2a8b47e 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -6174,8 +6174,9 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
>  	intel_encoder = &intel_dig_port->base;
>  	encoder = &intel_encoder->base;
>  
> -	drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs,
> -			 DRM_MODE_ENCODER_TMDS);
> +	if (drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs,
> +			     DRM_MODE_ENCODER_TMDS))
> +		goto err_encoder_init;
>  
>  	intel_encoder->compute_config = intel_dp_compute_config;
>  	intel_encoder->disable = intel_disable_dp;
> @@ -6224,6 +6225,7 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
>  
>  err_init_connector:
>  	drm_encoder_cleanup(encoder);
> +err_encoder_init:
>  	kfree(intel_connector);
>  err_connector_alloc:
>  	kfree(intel_dig_port);
> -- 
> 1.9.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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