linux-kernel - Re: [PATCH 2/2] MPI: Fix mpi_powm() when exponent is 0 and the result has no limbs

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Date:   Thu, 24 Nov 2016 14:22:58 +0300
From:   Andrey Ryabinin <ryabinin.a.a@...il.com>
To:     David Howells <dhowells@...hat.com>
Cc:     jmorris@...ei.org, Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-ima-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] MPI: Fix mpi_powm() when exponent is 0 and the result
 has no limbs

2016-11-24 14:17 GMT+03:00 David Howells <dhowells@...hat.com>:
> David Howells <dhowells@...hat.com> wrote:
>
>> +             if (!rp) {
>> +                     if (mpi_resize(res, 1) < 0)
>
> This is better done with RESIZE_IF_NEEDED().
>

mpi_resize() is equal to RESIZE_IF_NEEDED(), it also checks for allocated space:

int mpi_resize(MPI a, unsigned nlimbs)
{
....
   if (nlimbs <= a->alloced)
    return 0; /* no need to do it */



> David