linux-kernel - Re: [PATCH v2 net] rps: flow_dissector: Fix uninitialized flow_keys used in __skb_get

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Date:   Thu, 01 Sep 2016 22:45:23 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fgao@...ai8.com
Cc:     tom@...bertland.com, aduyck@...antis.com, amir@...ai.me,
        edumazet@...gle.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, gfree.wind@...il.com
Subject: Re: [PATCH v2 net] rps: flow_dissector: Fix uninitialized
 flow_keys used in __skb_get_hash possibly

From: fgao@...ai8.com
Date: Wed, 31 Aug 2016 14:15:05 +0800

> 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.
> 
> Fixes: 6db61d79c1e1 ("flow_dissector: Ignore flow dissector return value from ___skb_get_hash")
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Gao Feng <fgao@...ai8.com>

Applied.