linux-kernel - Re: [GIT] Digital signature library bugfix

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Date:	Wed, 12 Sep 2012 13:22:13 +0300
From:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	James Morris <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT] Digital signature library bugfix

On Wed, Sep 12, 2012 at 8:38 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Wed, Sep 12, 2012 at 11:34 AM, James Morris <jmorris@...ei.org> wrote:
>>
>> -       if (!err && len == hlen)
>> -               err = memcmp(out2, h, hlen);
>> +       if (err || len != hlen) {
>> +               err = -EINVAL;
>> +               goto err;
>> +       }
>> +
>> +       err = memcmp(out2, h, hlen);
>>
>>  err:
>
> Hmm. I'll pull, but this seems to drop the error return from
> pkcs_1_v1_5_decode_emsa() and always replace it with -EINVAL.
>
> Now, I didn't look, and maybe that's the only error that the decode
> thing can return, but still, it looks bad.
>
> Wouldn't it have been better to do instead
>
>    if (err)
>       goto err;
>    err = -EINVAL;
>    if (len != hlen)
>       goto err;
>
> and not overwrite the 'err' return with EINVAL?
>

Error code here just means success or failure.
I did not like it either, but that was just to fix a bug (cc:stable)
and I have one patch more to refactor that stuff for mainline kernel.

But I will re-send updated patch in a moment.

Thanks.

>              Linus
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