linux-kernel - Re: [PATCH 2.6.26] isofs: fix minor filesystem corruption

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Date:	Wed, 16 Jul 2008 10:04:56 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Adam Greenblatt" <adam.greenblatt@...il.com>
Cc:	akpm@...ux-foundation.org, jack@....cz,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.26] isofs: fix minor filesystem corruption

Hi Adam,

On Wed, Jul 16, 2008 at 7:41 AM, Adam Greenblatt
<adam.greenblatt@...il.com> wrote:
> Some iso9660 images contain files with rockridge data that is either
> incorrect or
> incompletely parsed.  Prior to commit
> f2966632a134e865db3c819346a1dc7d96e05309,
> (included with kernel 2.6.13) the kernel ignored the rockridge data for
> these files,
> while still allowing the files to be accessed under their non-rockridge
> names.  That commit
> inadvertently changed things so that files with invalid rockridge data could
> not be accessed
> at all.  (I ran across the problem when comparing some old CDs with hard
> disk copies I had
> made long ago under kernel 2.4: a few of the files on the hard disk copies
> were no longer
> visible on the CDs.)
>
> This change reverts to the pre-2.6.13 behavior.
>
> Signed-off-by: Adam Greenblatt <adam.greenblatt@...il.com>
> ---
> --- linux-2.6.26/fs/isofs/rock.c.orig   2008-07-15 18:19:36.000000000 -1000
> +++ linux-2.6.26/fs/isofs/rock.c        2008-07-15 18:16:56.000000000 -1000
> @@ -217,7 +217,7 @@ repeat:
>               rs.chr += rr->len;
>               rs.len -= rr->len;
>               if (rs.len < 0)
> -                       goto eio;       /* corrupted isofs */
> +                       goto out;       /* corrupted isofs */
>
>               switch (sig) {
>               case SIG('R', 'R'):

I suppose you want to fix parse_rock_ridge_inode_internal() also for
consistency and add a comment there why we don't fail for that case.
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