media: mtk-vcodec: potential dereference of null pointer

stable inclusion
from stable-v5.10.110
commit bc2573abc691a269b54a6c14a2660f26d88876a5
bugzilla: https://gitee.com/openeuler/kernel/issues/I574AL

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=bc2573abc691a269b54a6c14a2660f26d88876a5

--------------------------------

[ Upstream commit e25a89f7 ]

The return value of devm_kzalloc() needs to be checked.
To avoid use of null pointer in case of thefailure of alloc.

Fixes: 46233e91 ("media: mtk-vcodec: move firmware implementations into their own files")
Signed-off-by: NJiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: NTzung-Bi Shih <tzungbi@google.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYu Liao <liaoyu15@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c

@@ -102,6 +102,8 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_vpu_init(struct mtk_vcodec_dev *dev,
 	vpu_wdt_reg_handler(fw_pdev, mtk_vcodec_vpu_reset_handler, dev, rst_id);
 
 	fw = devm_kzalloc(&dev->plat_dev->dev, sizeof(*fw), GFP_KERNEL);
+	if (!fw)
+		return ERR_PTR(-ENOMEM);
 	fw->type = VPU;
 	fw->ops = &mtk_vcodec_vpu_msg;
 	fw->pdev = fw_pdev;