linux-kernel - Re: [PATCH -mm] sysfs: Fix oops in sysfs_drop_dentry on x86

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Message-ID: <466FF491.30409@gmail.com>
Date:	Wed, 13 Jun 2007 22:43:45 +0900
From:	Tejun Heo <htejun@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] sysfs: Fix oops in sysfs_drop_dentry on x86_64

Hello, Rafael.

Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Fix oops on x86_64 caused by the dereference of dir in sysfs_drop_dentry() made
> before checking if dir is not NULL
> (cf. http://marc.info/?l=linux-kernel&m=118151626704924&w=2).
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  fs/sysfs/inode.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6.22-rc4-mm2/fs/sysfs/inode.c
> ===================================================================
> --- linux-2.6.22-rc4-mm2.orig/fs/sysfs/inode.c
> +++ linux-2.6.22-rc4-mm2/fs/sysfs/inode.c
> @@ -285,7 +285,7 @@ void sysfs_drop_dentry(struct sysfs_dire
>  int sysfs_hash_and_remove(struct dentry * dir, const char * name)
>  {
>  	struct sysfs_dirent **pos, *sd;
> -	struct sysfs_dirent *parent_sd = dir->d_fsdata;
> +	struct sysfs_dirent *parent_sd;
>  	int found = 0;

Argh... Right.  My delusional mind somehow thought the nonsense early
dereferencing was there before any changes so I passed on that one.
Thanks a lot for catching it.  The whole sysfs patchset is pending
regeneration.  I'll include the fix patch.

Thanks a lot.  :-)

-- 
tejun
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