[PATCH 6.6 233/568] drm/mediatek/dp: Fix spurious kfree()

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

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

From: Michael Walle <mwalle@xxxxxxxxxx>

[ Upstream commit 8ad49a92cff4bab13eb2f2725243f5f31eff3f3b ]

drm_edid_to_sad() might return an error or just zero. If that is the
case, we must not free the SADs because there was no allocation in
the first place.

Fixes: dab12fa8d2bd ("drm/mediatek/dp: fix memory leak on ->get_edid callback audio detection")
Signed-off-by: Michael Walle <mwalle@xxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20240604083337.1879188-1-mwalle@xxxxxxxxxx/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index ff8436fb6e0d8..48a4defbc66cc 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -2058,9 +2058,15 @@ static const struct drm_edid *mtk_dp_edid_read(struct drm_bridge *bridge,
 		 */
 		const struct edid *edid = drm_edid_raw(drm_edid);
 		struct cea_sad *sads;
+		int ret;
 
-		audio_caps->sad_count = drm_edid_to_sad(edid, &sads);
-		kfree(sads);
+		ret = drm_edid_to_sad(edid, &sads);
+		/* Ignore any errors */
+		if (ret < 0)
+			ret = 0;
+		if (ret)
+			kfree(sads);
+		audio_caps->sad_count = ret;
 
 		/*
 		 * FIXME: This should use connector->display_info.has_audio from
-- 
2.43.0







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