Re: [PATCH net-next 1/6] net: prefer strscpy over strcpy

[Dan Carpenter <dan.carpenter@linaro.org>]

On Tue, Aug 27, 2024 at 07:35:22PM +0800, Hongbo Li wrote:
> The deprecated helper strcpy() performs no bounds checking on the
> destination buffer. This could result in linear overflows beyond
> the end of the buffer, leading to all kinds of misbehaviors.
> The safe replacement is strscpy() [1].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy [1]
> 
> Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
> ---
>  net/core/dev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 0d0b983a6c21..f5e0a0d801fd 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -11121,7 +11121,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
>  	if (!dev->ethtool)
>  		goto free_all;
>  
> -	strcpy(dev->name, name);
> +	strscpy(dev->name, name, sizeof(dev->name));

You can just do:

	strscpy(dev->name, name);

I prefer this format because it ensures that dev->name is an array and not a
pointer.  Also shorter.

regards,
dan carpenter