linux-kernel - [PATCH 4.9 12/25] drm/dp/mst: fix a possible memory leak in fetch_monitor

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Date:   Mon, 23 May 2022 19:03:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>,
        Lyude Paul <lyude@...hat.com>
Subject: [PATCH 4.9 12/25] drm/dp/mst: fix a possible memory leak in fetch_monitor_name()

From: Hangyu Hua <hbh25y@...il.com>

commit 6e03b13cc7d9427c2c77feed1549191015615202 upstream.

drm_dp_mst_get_edid call kmemdup to create mst_edid. So mst_edid need to be
freed after use.

Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Reviewed-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: stable@...r.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20220516032042.13166-1-hbh25y@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/drm_dp_mst_topology.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2830,6 +2830,7 @@ static void fetch_monitor_name(struct dr
 
 	mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
 	drm_edid_get_monitor_name(mst_edid, name, namelen);
+	kfree(mst_edid);
 }
 
 /**