netdev - Re: [PATCH RFC net-next] net: Assert napi_gro

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Message-Id: <20150731.134442.1572308169975939249.davem@davemloft.net>
Date:	Fri, 31 Jul 2015 13:44:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	f.fainelli@...il.com, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au, daniel@...earbox.net,
	edumazet@...gle.com
Subject: Re: [PATCH RFC net-next] net: Assert napi_gro_cb size against
 skb->cb[]

From: Florian Westphal <fw@...len.de>
Date: Fri, 31 Jul 2015 22:24:03 +0200

> Florian Fainelli <f.fainelli@...il.com> wrote:
>> On 64-bits hosts, napi_gro_cb is 48 bytes, which is exactly the size of
>> skb->cb[], while on 32-bits hosts it is 36 bytes, but if it were to
>> grow, we would not be catching a size inflation as we should.
>> ---
>>  net/core/dev.c | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 4870c3556a5a..20bc82604b75 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -4115,6 +4115,8 @@ static void skb_gro_reset_offset(struct sk_buff *skb)
>>  	const struct skb_shared_info *pinfo = skb_shinfo(skb);
>>  	const skb_frag_t *frag0 = &pinfo->frags[0];
>>  
>> +	BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct napi_gro_cb));
> 
> commit c3c7c254b2e8cd99b0adf288c2a1bddacd7ba255
> already added a check for this.

Indeed.
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