linux-kernel - [PATCH AUTOSEL 6.9 21/23] media: mtk-vcodec: potential null pointer deference in SCP

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Message-ID: <20240527155123.3863983-21-sashal@kernel.org>
Date: Mon, 27 May 2024 11:50:22 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Fullway Wang <fullwaywang@...look.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	tiffany.lin@...iatek.com,
	andrew-ct.chen@...iatek.com,
	yunfei.dong@...iatek.com,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	hverkuil-cisco@...all.nl,
	nicolas.dufresne@...labora.com,
	colin.i.king@...il.com,
	linux-media@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.9 21/23] media: mtk-vcodec: potential null pointer deference in SCP

From: Fullway Wang <fullwaywang@...look.com>

[ Upstream commit 53dbe08504442dc7ba4865c09b3bbf5fe849681b ]

The return value of devm_kzalloc() needs to be checked to avoid
NULL pointer deference. This is similar to CVE-2022-3113.

Link: https://lore.kernel.org/linux-media/PH7PR20MB5925094DAE3FD750C7E39E01BF712@PH7PR20MB5925.namprd20.prod.outlook.com
Signed-off-by: Fullway Wang <fullwaywang@...look.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c   | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c
index 6bbe55de6ce9a..ff23b225db705 100644
--- a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c
+++ b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c
@@ -79,6 +79,8 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_scp_init(void *priv, enum mtk_vcodec_fw_use
 	}
 
 	fw = devm_kzalloc(&plat_dev->dev, sizeof(*fw), GFP_KERNEL);
+	if (!fw)
+		return ERR_PTR(-ENOMEM);
 	fw->type = SCP;
 	fw->ops = &mtk_vcodec_rproc_msg;
 	fw->scp = scp;
-- 
2.43.0