linux-kernel - Re: [PATCH] drm: i915: fix a possible refcount leak in intel_dp_add_mst

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Message-ID: <2c51aa6e-1947-a4b2-c9af-f8c12b6a1985@gmail.com>
Date:   Thu, 23 Jun 2022 10:18:34 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...ux.ie, daniel@...ll.ch, ville.syrjala@...ux.intel.com,
        jose.souza@...el.com, Bhawanpreet.Lakha@....com,
        matthew.d.roper@...el.com, heying24@...wei.com,
        anshuman.gupta@...el.com, james.ausmus@...el.com
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: i915: fix a possible refcount leak in
 intel_dp_add_mst_connector()

On 2022/5/16 15:19, Hangyu Hua wrote:
> If drm_connector_init fails, intel_connector_free will be called to take
> care of proper free. So it is necessary to drop the refcount of port
> before intel_connector_free.
> 
> Fixes: 091a4f91942a ("drm/i915: Handle drm-layer errors in intel_dp_add_mst_connector")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>
> ---
>   drivers/gpu/drm/i915/display/intel_dp_mst.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index e30e698aa684..f7d46ea3afb9 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -841,6 +841,7 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
>   	ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
>   				 DRM_MODE_CONNECTOR_DisplayPort);
>   	if (ret) {
> +		drm_dp_mst_put_port_malloc(port);
>   		intel_connector_free(intel_connector);
>   		return NULL;
>   	}

Gentel ping.