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

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

The upstream commit SHA1 provided is correct: 53dbe08504442dc7ba4865c09b3bbf5fe849681b

WARNING: Author mismatch between patch and upstream commit:
Backport author: <jianqi.ren.cn@windriver.com>
Commit author: Fullway Wang <fullwaywang@outlook.com>


Status in newer kernel trees:
6.12.y | Present (exact SHA1)
6.6.y | Present (different SHA1: f066882293b5)
6.1.y | Not found

Note: The patch differs from the upstream commit:
---
1:  53dbe08504442 ! 1:  27bb87502a715 media: mtk-vcodec: potential null pointer deference in SCP
    @@ Metadata
      ## Commit message ##
         media: mtk-vcodec: potential null pointer deference in SCP
     
    +    [ 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>
    +    Signed-off-by: Jianqi Ren <jianqi.ren.cn@windriver.com>
     
    - ## drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c ##
    -@@ drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_scp.c: struct mtk_vcodec_fw *mtk_vcodec_fw_scp_init(void *priv, enum mtk_vcodec_fw_use
    + ## drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c ##
    +@@ drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_scp.c: struct mtk_vcodec_fw *mtk_vcodec_fw_scp_init(struct mtk_vcodec_dev *dev)
      	}
      
    - 	fw = devm_kzalloc(&plat_dev->dev, sizeof(*fw), GFP_KERNEL);
    + 	fw = devm_kzalloc(&dev->plat_dev->dev, sizeof(*fw), GFP_KERNEL);
     +	if (!fw)
     +		return ERR_PTR(-ENOMEM);
      	fw->type = SCP;
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Success   |