[Ocfs2-devel] [PATCH 1/1] ocfs2: Add readonly check in ocfs2_quota_on().

[Sunil Mushran <sunil.mushran@oracle.com>]

looks good.

On 06/01/2011 01:19 AM, Tristan Ye wrote:
> Enabling quota on a readonly ocfs2 fs caused a 'NULL pointer dereference' in
> dquot_enable(), a very straightforward fix is to check readonly at the very
> beginning of ocfs2_quota_on(), which calls dquot_enable().
>
> Signed-off-by: Tristan Ye<tristan.ye@oracle.com>
> ---
>   fs/ocfs2/super.c |    4 ++++
>   1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index 029c4cd..3cade2a 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -995,6 +995,10 @@ static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
>   	if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
>   		return -EINVAL;
>
> +	if (ocfs2_is_hard_readonly(OCFS2_SB(sb))) {
> +		return -EROFS;
> +	}
> +
>   	return dquot_enable(sb_dqopt(sb)->files[type], type,
>   			    format_id, DQUOT_LIMITS_ENABLED);
>   }