xfs: don't wrap ID in xfs_dq_get_next_id

The GETNEXTQOTA ioctl takes whatever ID is sent in,
and looks for the next active quota for an user
equal or higher to that ID.

But if we are at the maximum ID and then ask for the "next"
one, we may wrap back to zero.  In this case, userspace
may loop forever, because it will start querying again
at zero.

We'll fix this in userspace as well, but for the kernel,
return -ENOENT if we ask for the next quota ID
past UINT_MAX so the caller knows to stop.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 7a30b8f11db7a26f8a82ded531e8a5170ea03ad5..9d06cc30e875e147a5560bad24e5a55aedb65cf0 100644 (file)
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -710,6 +710,10 @@ xfs_dq_get_next_id(
        /* Simple advance */
        next_id = *id + 1;
 
+       /* If we'd wrap past the max ID, stop */
+       if (next_id < *id)
+               return -ENOENT;
+
        /* If new ID is within the current chunk, advancing it sufficed */
        if (next_id % mp->m_quotainfo->qi_dqperchunk) {
                *id = next_id;