[PATCH 6.1.y] media: mtk-vcodec: potential null pointer deference in SCP

[Imkanmod Khan <imkanmodkhan@gmail.com>]

From: Fullway Wang <fullwaywang@outlook.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@outlook.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
[ To fix CVE: CVE-2024-40973, modified the file path from drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c
 to drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c and minor conflict resolution ]
Signed-off-by: Imkanmod Khan <imkanmodkhan@gmail.com>
---
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c
index d8e66b645bd8..27f08b1d34d1 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c
@@ -65,6 +65,8 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_scp_init(struct mtk_vcodec_dev *dev)
 	}
 
 	fw = devm_kzalloc(&dev->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;
-- 
2.25.1