Re: [Xen-devel] BUG in xennet_make_frags with paged skb data

[Zoltan Kiss <zoltan.kiss@linaro.org>]

On 07/11/14 12:15, Stefan Bader wrote:
> On 07.11.2014 12:22, Eric Dumazet wrote:
>> On Fri, 2014-11-07 at 09:25 +0000, Zoltan Kiss wrote:
>>
>> Please do not top post.
>>
>>> Hi,
>>>
>>> AFAIK in this scenario your skb frag is wrong. The page pointer should
>>> point to the original compound page (not a member of it), and offset
>>> should be set accordingly.
>>> For example, if your compound page is 16K (4 page), then the page
>>> pointer should point to the first page, and if the data starts at the
>>> 3rd page, then offset should be >8K
>>
>> This is not accurate.
>>
>> This BUG_ON() is wrong.
>>
>> It should instead be :
>>
>> BUG_ON(len + offset > PAGE_SIZE<<compound_order(compound_head(page)));
>
> would that not have to be
>
> BUG_ON((page-compound_head(page)*PAGE_SIZE)+offset+len >
> PAGE_SIZE<<compound_order(compound_head(page)));

There should be a parentheses around "page-compound_head(page)".
>
> since offset is adjusted to start from the tail page in that case.
>>
>> splice() code can generate such cases.
>>
>>
>
>