linux-kernel - [PATCH] media: mtk-vcodec: potential null pointer deference in SCP

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Date: Thu, 18 Jan 2024 10:35:06 +0800
From: Fullway Wang <fullwaywang@...look.com>
To: tiffany.lin@...iatek.com,
	andrew-ct.chen@...iatek.com,
	yunfei.dong@...iatek.com
Cc: fullwaywang@...cent.com,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Fullway Wang <fullwaywang@...look.com>
Subject: [PATCH] media: mtk-vcodec: potential null pointer deference in SCP

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

Signed-off-by: Fullway Wang <fullwaywang@...look.com>
---
 .../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 6bbe55de6ce9..ff23b225db70 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;
-- 
2.39.3 (Apple Git-145)