linux-kernel - Re: [PATCH][next] nfp: flower: Use struct

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Date:   Wed, 26 Jan 2022 09:24:03 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, oss-drivers@...igine.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] nfp: flower: Use struct_size() helper in kmalloc()

On Tue, Jan 25, 2022 at 01:33:19PM -0600, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worst scenario, could lead to heap overflows.
> 
> Also, address the following sparse warnings:
> drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c:359:25: warning: using sizeof on a flexible structure
> 
> Link: https://github.com/KSPP/linux/issues/174
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Acked-by: Simon Horman <simon.horman@...igine.com>

> ---
>  drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
> index dfb4468fe287..ce865e619568 100644
> --- a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
> +++ b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
> @@ -356,7 +356,7 @@ __nfp_tun_add_route_to_cache(struct list_head *route_list,
>  			return 0;
>  		}
>  
> -	entry = kmalloc(sizeof(*entry) + add_len, GFP_ATOMIC);
> +	entry = kmalloc(struct_size(entry, ip_add, add_len), GFP_ATOMIC);
>  	if (!entry) {
>  		spin_unlock_bh(list_lock);
>  		return -ENOMEM;
> -- 
> 2.27.0
>