linux-kernel - Re: [PATCH] [fs/sysv] Fix NULL deref. when allocating new inode

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Message-Id: <20100621154046.b5e8319c.akpm@linux-foundation.org>
Date:	Mon, 21 Jun 2010 15:40:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lubomir Rintel <lkundrak@...sk>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] [fs/sysv] Fix NULL deref. when allocating new inode

On Sun, 20 Jun 2010 15:17:23 +0200
Lubomir Rintel <lkundrak@...sk> wrote:

> A call to sysv_write_inode() in sysv_new_inode() to its new interface
> that replaced wait flag with writeback structure. This was broken by
> a9185b41a4f84971b930c519f0c63bd450c4810d.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>
> ---
> Resending this.
>  fs/sysv/ialloc.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/sysv/ialloc.c b/fs/sysv/ialloc.c
> index 241e976..f2764e2 100644
> --- a/fs/sysv/ialloc.c
> +++ b/fs/sysv/ialloc.c
> @@ -25,6 +25,7 @@
>  #include <linux/stat.h>
>  #include <linux/string.h>
>  #include <linux/buffer_head.h>
> +#include <linux/writeback.h>
>  #include "sysv.h"
>  
>  /* We don't trust the value of
> @@ -139,6 +140,9 @@ struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
>  	struct inode *inode;
>  	sysv_ino_t ino;
>  	unsigned count;
> +	struct writeback_control wbc = {
> +		.sync_mode = WB_SYNC_NONE
> +	};
>  
>  	inode = new_inode(sb);
>  	if (!inode)
> @@ -177,7 +181,7 @@ struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
>  	mark_inode_dirty(inode);
>  
>  	inode->i_mode = mode;		/* for sysv_write_inode() */
> -	sysv_write_inode(inode, 0);	/* ensure inode not allocated again */
> +	sysv_write_inode(inode, &wbc);	/* ensure inode not allocated again */
>  	mark_inode_dirty(inode);	/* cleared by sysv_write_inode() */
>  	/* That's it. */
>  	unlock_super(sb);

hm.  AFACIT this means that 2.6.34's sysvfs will instantaneously oops,
every time.
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