linux-kernel - Re: [Patch] hfsplus oops on image without extends

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Message-ID: <20080509131326.GA31089@shadowen.org>
Date:	Fri, 9 May 2008 14:13:26 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Eric Sesterhenn <snakebyte@....de>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, zippel@...ux-m68k.org
Subject: Re: [Patch] hfsplus oops on image without extends

On Wed, May 07, 2008 at 12:42:44PM +0200, Eric Sesterhenn wrote:
> hi,
> 
> the following patch fixes an oops with a corrupted hfs+ image.
> see http://bugzilla.kernel.org/show_bug.cgi?id=10548 for details.
> 
> Problem is that we call hfs_btree_open() from hfsplus_fill_super() to set
> HFSPLUS_SB(sb).[ext_tree|cat_tree]
> Both trees are still NULL at this moment. If hfs_btree_open() fails for
> any reason it calls iput() on the page, which
> gets to hfsplus_releasepage() which tries to access HFSPLUS_SB(sb).*
> which is still NULL and oopses while dereferencing it.
> 
> 
> Signed-off-by: Eric Sesterhenn <snakebyte@....de>
> 
> --- linux-2.6/fs/hfsplus/inode.c.orig	2008-05-07 14:37:31.000000000 +0200
> +++ linux-2.6/fs/hfsplus/inode.c	2008-05-07 14:38:05.000000000 +0200
> @@ -65,6 +65,8 @@ static int hfsplus_releasepage(struct pa
>  		BUG();
>  		return 0;
>  	}
> +	it (!tree)
> +		return 0;

Erm, I presume this is meant to be 'if', checkpatch whined about the
space as it thought it was a function.  I guess this hasn't been compile
tested?

>  	if (tree->node_size >= PAGE_CACHE_SIZE) {
>  		nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
>  		spin_lock(&tree->hash_lock);

-apw
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