linux-kernel - [PATCH] drm/mediatek/dp: fix memory leak on ->get

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Date:   Thu, 14 Sep 2023 16:10:58 +0300
From:   Jani Nikula <jani.nikula@...el.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     jani.nikula@...el.com,
        Markus Schneider-Pargmann <msp@...libre.com>,
        Guillaume Ranquet <granquet@...libre.com>,
        Bo-Chen Chen <rex-bc.chen@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org
Subject: [PATCH] drm/mediatek/dp: fix memory leak on ->get_edid callback error path

Setting new_edid to NULL leaks the buffer.

Fixes: f70ac097a2cf ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
Cc: Markus Schneider-Pargmann <msp@...libre.com>
Cc: Guillaume Ranquet <granquet@...libre.com>
Cc: Bo-Chen Chen <rex-bc.chen@...iatek.com>
Cc: CK Hu <ck.hu@...iatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-mediatek@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: <stable@...r.kernel.org> # v6.1+
Signed-off-by: Jani Nikula <jani.nikula@...el.com>

---

UNTESTED
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 2cb47f663756..8fc6eff68e30 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -2049,6 +2049,7 @@ static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 	 */
 	if (mtk_dp_parse_capabilities(mtk_dp)) {
 		drm_err(mtk_dp->drm_dev, "Can't parse capabilities\n");
+		kfree(new_edid);
 		new_edid = NULL;
 	}
 
-- 
2.39.2