As noted in the kernel documentation [1], open-coded multiplication in
allocator arguments is discouraged because it can lead to integer overflow.

Use devm_kcalloc() to gain built-in overflow protection, making memory
allocation safer when calculating allocation size compared to explicit
multiplication.

Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments #1
Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
index 0255c8acb744..4cce4f4ba6b0 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
@@ -843,7 +843,7 @@ static int hns3_dbg_bd_file_init(struct hnae3_handle *handle, u32 cmd)
 
 	entry_dir = hns3_dbg_dentry[hns3_dbg_cmd[cmd].dentry].dentry;
 	max_queue_num = hns3_get_max_available_channels(handle);
-	data = devm_kzalloc(&handle->pdev->dev, max_queue_num * sizeof(*data),
+	data = devm_kcalloc(&handle->pdev->dev, max_queue_num, sizeof(*data),
 			    GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
-- 
2.34.1

on 2025/8/25 22:27, Qianfeng Rong wrote:
> As noted in the kernel documentation [1], open-coded multiplication in
> allocator arguments is discouraged because it can lead to integer overflow.
>
> Use devm_kcalloc() to gain built-in overflow protection, making memory
> allocation safer when calculating allocation size compared to explicit
> multiplication.
>
> Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments #1
> Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
> ---

Thanks,
Reviewed-by: Jijie Shao <shaojijie@huawei.com>

>   drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
> index 0255c8acb744..4cce4f4ba6b0 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
> @@ -843,7 +843,7 @@ static int hns3_dbg_bd_file_init(struct hnae3_handle *handle, u32 cmd)
>   
>   	entry_dir = hns3_dbg_dentry[hns3_dbg_cmd[cmd].dentry].dentry;
>   	max_queue_num = hns3_get_max_available_channels(handle);
> -	data = devm_kzalloc(&handle->pdev->dev, max_queue_num * sizeof(*data),
> +	data = devm_kcalloc(&handle->pdev->dev, max_queue_num, sizeof(*data),
>   			    GFP_KERNEL);
>   	if (!data)
>   		return -ENOMEM;