On Mon, 2011-10-03 at 21:05 +0200, Michael S. Tsirkin wrote:
> I thought about this some more. If length was too large host is
> right now writing into pages that we have freed.
> That is very bad, and I don't know what do do with it,
> really not worth prettifying that IMO, NULL pointer is the least of our
> worries.
>
> But, with mergeable buffers at least, and that is the main mode anyway,
> there is always a single page per buf, right?
> So I think we should change the code,
> and for mergeable buffers we shall only verify that
> length <= PAGE_SIZE.
In receive_mergeable() we already verify both 'page' being non-null and
length:
if (len > PAGE_SIZE)
len = PAGE_SIZE;
>
> IOW copy a bit of code from page_to_skb(vi, page, len)
> to receive_mergeable, maybe add a common function
> if we need to avoid duplication.
--
Sasha.
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