netdev - Re: [PATCH] net/bridge: replace simple

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Date:   Mon, 22 Nov 2021 12:04:35 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Bernard Zhao <bernard@...o.com>
Cc:     Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/bridge: replace simple_strtoul to kstrtol

On Thu, Nov 18, 2021 at 06:06:42PM -0800, Bernard Zhao wrote:
> simple_strtoull is obsolete, use kstrtol instead.
> 
> Signed-off-by: Bernard Zhao <bernard@...o.com>
> ---
>  net/bridge/br_sysfs_br.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
> index d9a89ddd0331..11c490694296 100644
> --- a/net/bridge/br_sysfs_br.c
> +++ b/net/bridge/br_sysfs_br.c
> @@ -36,15 +36,14 @@ static ssize_t store_bridge_parm(struct device *d,
>  	struct net_bridge *br = to_bridge(d);
>  	struct netlink_ext_ack extack = {0};
>  	unsigned long val;
> -	char *endp;
>  	int err;
>  
>  	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
>  		return -EPERM;
>  
> -	val = simple_strtoul(buf, &endp, 0);
> -	if (endp == buf)
> -		return -EINVAL;
> +	err = kstrtoul(buf, 10, &val);

Base 16 is valid.

Before this patch:

# ip link add name br0 type bridge vlan_filtering 1
# echo "0x88a8" > /sys/class/net/br0/bridge/vlan_protocol
# echo $?
0

After this patch:

# ip link add name br0 type bridge vlan_filtering 1
# echo "0x88a8" > /sys/class/net/br0/bridge/vlan_protocol 
bash: echo: write error: Invalid argument

> +	if (err != 0)
> +		return err;
>  
>  	if (!rtnl_trylock())
>  		return restart_syscall();
> -- 
> 2.33.1
>