netdev - Re: [Patch net v2] net: fix a potential recursive NETDEV_FEAT

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Message-ID: <65667dcb-5678-2744-8d05-b66bff325f05@cumulusnetworks.com>
Date:   Thu, 7 May 2020 21:50:00 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        syzbot <syzbot+e73ceacfd8560cc8a3ca@...kaller.appspotmail.com>,
        syzbot+c2fb6f9ddcea95ba49b5@...kaller.appspotmail.com,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [Patch net v2] net: fix a potential recursive NETDEV_FEAT_CHANGE

On 07/05/2020 21:45, Cong Wang wrote:
> On Wed, May 6, 2020 at 1:31 PM Nikolay Aleksandrov
> <nikolay@...ulusnetworks.com> wrote:
>> The patch looks good, but note that __netdev_update_features() used to return -1
>> before the commit in the Fixes tag above (between 6cb6a27c45ce and 00ee59271777).
>> It only restored that behaviour.
> 
> Good point! But commit fd867d51f889 is the one which started
> using netdev_update_features() in netdev_sync_lower_features(),
> your commits 00ee59271777 and 17b85d29e82c are both after it,
> and returning whatever doesn't matter before commit fd867d51f889,
> therefore, commit fd867d51f889 is the right one to blame?
> 

Right, that should be the one.

> I will send V3 to just update this Fixes tag.
> 
> Thanks!
> 

Cheers,
 Nik