linux-kernel - Re: [PATCH v2] crypto: sun8i-ce: fix multiple memory leaks in sun8i_ce_hash

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Date:   Thu, 12 Aug 2021 18:40:20 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Corentin Labbe <clabbe.montjoie@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Xiang Chen <chenxiang66@...ilicon.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Corentin Labbe <clabbe@...libre.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Ard Biesheuvel <ardb@...nel.org>, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] crypto: sun8i-ce: fix multiple memory leaks in sun8i_ce_hash_run

On Thu, Aug 12, 2021 at 6:30 PM Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> On Thu, Aug 12, 2021 at 06:24:25PM +0800, Dongliang Mu wrote:
> > On Thu, Aug 12, 2021 at 6:05 PM Herbert Xu <herbert@...dor.apana.org.au> wrote:
> > >
> > > On Tue, Aug 03, 2021 at 02:31:38PM +0800, Dongliang Mu wrote:
> > > >
> > > > -theend:
> > > > -     kfree(buf);
> > > > +err_result:
> > > >       kfree(result);
> > > > -     crypto_finalize_hash_request(engine, breq, err);
> > > > +err_buf:
> > > > +     kfree(buf);
> > > > +out:
> > > > +     if (!err)
> > > > +             crypto_finalize_hash_request(engine, breq, err);
> > > >       return 0;
> > >
> > > This does not look right.  You're returning zero in case of an error
> >
> > Hi Herbert,
> >
> > Corentin Labbe said,
> >
> > For the error code, I am not sure it is needed, error code is already
> > given to user via crypto_finalize_hash_request().
>
> Yes but your patch changes this.  You're now skipping the finalize
> call and thus throwing away err if it's not zero.
>

I see. Thanks for your comment.

I agree with you and would like to modify "return 0" to "return err"
in the next version.  Even if the parent function does not care about
the return value, it is still necessary to keep the right return
value.

Corentin, how do you think?

> If it's supposed to do this you need to explain it in your patch
> submission.
>
> Cheers,
> --
> Email: Herbert Xu <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt