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-   -   Ack: ocfs2: Fix NULL pointer dereferrence in __ocfs2_change_file_space (http://www.linux-archive.org/ubuntu-kernel-team/678181-ack-ocfs2-fix-null-pointer-dereferrence-__ocfs2_change_file_space.html)

Seth Forshee 06-28-2012 04:37 PM

Ack: ocfs2: Fix NULL pointer dereferrence in __ocfs2_change_file_space
 
On Thu, Jun 28, 2012 at 05:29:59PM +0100, 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@vger.kernel.org
> Signed-off-by: Luis Henriques <luis.henriques@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);
> --
> 1.7.9.5
>
>
> --
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