Re: [PATCH 5/8] lib/scatterlist: Add sg_len helper

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On 09/09/2015 09:56 AM, Stephan Mueller wrote:
>>> But in the rsa.c enc/dec/verify/sign functions, there should be such check,
>>> >> I would guess.
>> >
>> >There is see line 419:
>> >return pkey->n ? mpi_get_size(pkey->n) : -EINVAL;
> I feel we are not talking about the same issue. I refer to your patch in 
> rsa.c:
> 
> +       int src_len = sg_len(req->src), dst_len = sg_len(req->dst);
> 
> ===> can be negative according to your statement
> 
> ...
> 
> +               void *ptr = kmalloc(dst_len, GFP_KERNEL);
> 
> ===> with a negative number, I guess we have a problem here.

Yes, sorry, you are right. sg_len() will only return positive numbers or zero.
rsa.c checks it in all four operations:
if (unlikely(!pkey->n || !pkey->d || !src_len)) 
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