linux-kernel - Re: [PATCH net] rps: flow_dissector: Fix uninitialized flow_keys used in __skb_get

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Message-ID: <CA+6hz4rzMpNFOtr9m0pox1ejMBF5cQXgb9eGoR8q8sDeLTMvqA@mail.gmail.com>
Date:   Wed, 31 Aug 2016 12:16:39 +0800
From:   Gao Feng <fgao@...ai8.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Philp Prindeville <philipp@...fish-solutions.com>,
        Tom Herbert <tom@...bertland.com>,
        Alex Duyck <aduyck@...antis.com>, amir@...ai.me,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] rps: flow_dissector: Fix uninitialized flow_keys used
 in __skb_get_hash possibly

On Wed, Aug 31, 2016 at 12:14 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2016-08-31 at 10:56 +0800, fgao@...ai8.com wrote:
>> From: Gao Feng <fgao@...ai8.com>
>>
>> The original codes depend on that the function parameters are evaluated from
>> left to right. But the parameter's evaluation order is not defined in C
>> standard actually.
>>
>> When flow_keys_have_l4(&keys) is invoked before ___skb_get_hash(skb, &keys,
>> hashrnd) with some compilers or environment, the keys passed to
>> flow_keys_have_l4 is not initialized.
>>
>> Signed-off-by: Gao Feng <fgao@...ai8.com>
>> ---
>
> Good catch, please add
>
> Fixes: 6db61d79c1e1 ("flow_dissector: Ignore flow dissector return value from ___skb_get_hash")
> Acked-by: Eric Dumazet <edumazet@...gle.com>
>
>

Add it into the description and resend the patch again?

Best Regards
Feng