Applied: [Precise][Quantal][PATCH 1/1] ocfs2: Fix NULL pointer dereferrence in __ocfs2_change_file_space

[Leann Ogasawara]

Applied to Precise and Quantal master-next.  I added the BugLink and
also marked this as SAUCE as it has not officially landed in Linus' tree
yet.

Thanks,
Leann

On 06/28/2012 09:29 AM, Luis Henriques wrote:
> As ocfs2_fallocate() will invoke __ocfs2_change_file_space() with a NULL
> as the first parameter (file), it may trigger a NULL pointer dereferrence
> due to a missing check.  See http://bugs.launchpad.net/bugs/1006012.
>
> Cc: stable at vger.kernel.org
> Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
> ---
>  fs/ocfs2/file.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index 6e39668..84822a4 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -1950,7 +1950,7 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
>  	if (ret < 0)
>  		mlog_errno(ret);
>  
> -	if (file->f_flags & O_SYNC)
> +	if (file && (file->f_flags & O_SYNC))
>  		handle->h_sync = 1;
>  
>  	ocfs2_commit_trans(osb, handle);