[PATCHv3 06/11] crypto: omap-des: Fix support for unequal lengths

[Tero Kristo]

On 13/09/16 12:35, Herbert Xu wrote:
> On Thu, Aug 04, 2016 at 01:28:41PM +0300, Tero Kristo wrote:
>> From: Lokesh Vutla <a0131933 at ti.com>
>>
>> For cases where total length of an input SGs is not same as
>> length of the input data for encryption, omap-des driver
>> crashes. This happens in the case when IPsec is trying to use
>> omap-des driver.
>>
>> To avoid this, we copy all the pages from the input SG list
>> into a contiguous buffer and prepare a single element SG list
>> for this buffer with length as the total bytes to crypt, which is
>> similar thing that is done in case of unaligned lengths.
>
> Ugh, that means copying every single packet, right?
>
> So if it's just the SG list that's the problem, why don't you
> copy that instead? That is, allocate a new SG list and set it
> up so that there is no excess data.
>
> Cheers,
>

I'll take a look at this. I have this kind of solution in place for the 
re-worked SHA driver, so can probably re-use it here.

-Tero