linux-kernel - Re: [PATCH] dsa: bcm_sf2_cfp: fix an incorrect NULL check on list iterator

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Date:   Sun, 27 Mar 2022 19:51:39 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        Xiaomeng Tong <xiam0nd.tong@...il.com>
Cc:     andrew@...n.ch, vivien.didelot@...il.com, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] dsa: bcm_sf2_cfp: fix an incorrect NULL check on list
 iterator



On 3/27/2022 11:58 AM, Vladimir Oltean wrote:
> On Sun, Mar 27, 2022 at 01:55:47PM +0800, Xiaomeng Tong wrote:
>> The bug is here:
>> 	return rule;
>>
>> The list iterator value 'rule' will *always* be set and non-NULL
>> by list_for_each_entry(), so it is incorrect to assume that the
>> iterator value will be NULL if the list is empty or no element
>> is found.
>>
>> To fix the bug, return 'rule' when found, otherwise return NULL.
>>
>> Cc: stable@...r.kernel.org
>> Fixes: ae7a5aff783c7 ("net: dsa: bcm_sf2: Keep copy of inserted rules")
>> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
>> ---
> 
> The change looks correct, but from a process standpoint for next time
> (a) you should have copied Florian, the driver's maintainer (which I did now)
>      who appears on the top of the list in the output of ./get_maintainer.pl
> (b) networking bugfixes that apply to the "net" tree shouldn't need
>      stable@...r.kernel.org copied, instead just target the patch against
>      the https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
>      tree and mark the subject prefix as "[PATCH net]".
> 
> Reviewed-by: Vladimir Oltean <olteanv@...il.com>

If you could please resubmit with the subject being:

net: dsa: bcm_sf2_cfp: fix an incorrect NULL check on list iterator

and add Vladimir's and my tag below:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

That would be great! Thanks
-- 
Florian