Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <2c51aa6e-1947-a4b2-c9af-f8c12b6a1985@gmail.com>
Date:   Thu, 23 Jun 2022 10:18:34 +0800
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.9.1
Subject: Re: [PATCH] drm: i915: fix a possible refcount leak in
 intel_dp_add_mst_connector()
Content-Language: en-US
To:     jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com,
        rodrigo.vivi@intel.com, tvrtko.ursulin@linux.intel.com,
        airlied@linux.ie, daniel@ffwll.ch, ville.syrjala@linux.intel.com,
        jose.souza@intel.com, Bhawanpreet.Lakha@amd.com,
        matthew.d.roper@intel.com, heying24@huawei.com,
        anshuman.gupta@intel.com, james.ausmus@intel.com
Cc:     intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org
References: <20220516071922.22955-1-hbh25y@gmail.com>
From:   Hangyu Hua <hbh25y@gmail.com>
In-Reply-To: <20220516071922.22955-1-hbh25y@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

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@gmail.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.