[PATCH] net/bridge: replace simple_strtoul to kstrtol

[PATCH] net/bridge: replace simple_strtoul to kstrtol

[Bernard Zhao]

simple_strtoull is obsolete, use kstrtol instead.

Signed-off-by: Bernard Zhao <bernard@vivo.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);
+	if (err != 0)
+		return err;
 
 	if (!rtnl_trylock())
 		return restart_syscall();
-- 
2.33.1

Re: [PATCH] net/bridge: replace simple_strtoul to kstrtol

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Thu, 18 Nov 2021 18:06:42 -0800 you wrote:
> simple_strtoull is obsolete, use kstrtol instead.
> 
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
> ---
>  net/bridge/br_sysfs_br.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)

Here is the summary with links:
  - net/bridge: replace simple_strtoul to kstrtol
    https://git.kernel.org/netdev/net-next/c/520fbdf7fb19

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

RE: [PATCH] net/bridge: replace simple_strtoul to kstrtol

[David Laight]

From: Bernard Zhao
> Sent: 19 November 2021 02:07
> 
> simple_strtoull is obsolete, use kstrtol instead.

I think the death announcement of simple_strtoull() has already
been deemed premature.
kstrtol() isn't a replacment in many cases.

> Signed-off-by: Bernard Zhao <bernard@vivo.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);
> +	if (err != 0)
> +		return err;

That changes the valid input strings.
So is a UAPI change.
Now it might be that no one passes in strings that now fail,
but you can't tell.

Rightfully or not it used to ignore any trailing characters.
So "10flobbs" would be treated as "10".

Did you also check what happens to 0x1234 and 012 ?

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

Re: [PATCH] net/bridge: replace simple_strtoul to kstrtol

[Ido Schimmel]

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@vivo.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
> 

Re: [PATCH] net/bridge: replace simple_strtoul to kstrtol

[Nikolay Aleksandrov]

On 22/11/2021 12:04, Ido Schimmel wrote:
> 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@vivo.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
> 

Good catch, Bernard please send a revert. Thanks.

Re: [PATCH] net/bridge: replace simple_strtoul to kstrtol

[Jakub Kicinski]

On Mon, 22 Nov 2021 12:17:39 +0200 Nikolay Aleksandrov wrote:
> > # 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
> 
> Good catch, Bernard please send a revert. Thanks.

Doesn't look like he did, would you mind taking over?

Re: [PATCH] net/bridge: replace simple_strtoul to kstrtol

[Nikolay Aleksandrov]

On 24/11/2021 06:13, Jakub Kicinski wrote:
> On Mon, 22 Nov 2021 12:17:39 +0200 Nikolay Aleksandrov wrote:
>>> # 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
>>
>> Good catch, Bernard please send a revert. Thanks.
> 
> Doesn't look like he did, would you mind taking over?
> 

Ido sent a patch to take care of it:
https://patchwork.kernel.org/project/netdevbpf/patch/20211124101122.3321496-1-idosch@idosch.org/

Cheers,
 Nik