[PATCH 6.1 324/372] drm/mediatek/dp: fix memory leak on ->get_edid callback audio detection

[Greg Kroah-Hartman]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jani Nikula <jani.nikula at intel.com>

commit dab12fa8d2bd3868cf2de485ed15a3feef28a13d upstream.

The sads returned by drm_edid_to_sad() needs to be freed.

Fixes: e71a8ebbe086 ("drm/mediatek: dp: Audio support for MT8195")
Cc: Guillaume Ranquet <granquet at baylibre.com>
Cc: Bo-Chen Chen <rex-bc.chen at mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
Cc: Dmitry Osipenko <dmitry.osipenko at collabora.com>
Cc: Chun-Kuang Hu <chunkuang.hu at kernel.org>
Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: Matthias Brugger <matthias.bgg at gmail.com>
Cc: dri-devel at lists.freedesktop.org
Cc: linux-mediatek at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: <stable at vger.kernel.org> # v6.1+
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
Reviewed-by: Chen-Yu Tsai <wenst at chromium.org>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230914155317.2511876-1-jani.nikula@intel.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/mediatek/mtk_dp.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -1983,7 +1983,6 @@ static struct edid *mtk_dp_get_edid(stru
 	bool enabled = mtk_dp->enabled;
 	struct edid *new_edid = NULL;
 	struct mtk_dp_audio_cfg *audio_caps = &mtk_dp->info.audio_cur_cfg;
-	struct cea_sad *sads;
 
 	if (!enabled) {
 		drm_bridge_chain_pre_enable(bridge);
@@ -2010,7 +2009,11 @@ static struct edid *mtk_dp_get_edid(stru
 	}
 
 	if (new_edid) {
+		struct cea_sad *sads;
+
 		audio_caps->sad_count = drm_edid_to_sad(new_edid, &sads);
+		kfree(sads);
+
 		audio_caps->detect_monitor = drm_detect_monitor_audio(new_edid);
 	}