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.

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>

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 6bbe55de6ce9ac1a96c3dac21dd45ebde45842ef..ff23b225db705acdf8e13f86571c88a0420a78db 100644 (file)
--- 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;