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

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Message-Id: <20220516071922.22955-1-hbh25y@gmail.com>
Date:   Mon, 16 May 2022 15:19:22 +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, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] drm: i915: fix a possible refcount leak in intel_dp_add_mst_connector()

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;
 	}
-- 
2.25.1