linux-kernel - Re: [PATCH 1/2] inflate_fast: sout is already a short so ptr arith was off by one.

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Date:	Wed, 3 Mar 2010 08:35:37 +0100
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] inflate_fast: sout is already a short so ptr arith was off
 by one.

Andrew Morton <akpm@...ux-foundation.org> wrote on 2010/03/02 23:52:31:
>
> On Sun, 28 Feb 2010 17:06:02 +0100
> Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se> wrote:
>
> > This won't change anything for current code, but post increment
> > will break without this fix, should anyone want to try that.
> >
>
> The description is a bit cryptic.  Hopefully you understand what you
> mean, but does anyone else?

ehh, yes the commit msg is a bit cryptic. I can fix that.

>
> > diff --git a/lib/zlib_inflate/inffast.c b/lib/zlib_inflate/inffast.c
> > index fa62fc7..2c13ecc 100644
> > --- a/lib/zlib_inflate/inffast.c
> > +++ b/lib/zlib_inflate/inffast.c
> > @@ -286,7 +286,7 @@ void inflate_fast(z_streamp strm, unsigned start)
> >            } else { /* dist == 1 or dist == 2 */
> >           unsigned short pat16;
> >
> > -         pat16 = *(sout-2+2*OFF);
> > +         pat16 = *(sout-1+OFF);
> >           if (dist == 1) {
> >              union uu mm;
> >              /* copy one char pattern to both bytes */
>
> The code you're altering was changed two months ago by, err, you.  I
> don't know if the patch still makes sense in current kernels.
>
> Please don't raise patches against old kernels.  Please check that,
> redo the patch, add a changelog which helps non-inffast.c people
> understand what it does, then resend?

Not old, too new actually. You are sitting on a patch from me named
 zlib: Make new optimized inflate endian independent
that was deferred to 2.6.34.
This patch is on top of that one.

What should I do now?

   Jocke

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