[XFS] Fix use-after-free with log and quotas
Destroying the quota stuff on unmount can access the log - ie
XFS_QM_DONE() ends up in xfs_dqunlock() which calls
xfs_trans_unlocked_item() and then xfs_log_move_tail(). By this time the
log has already been destroyed. Just move the cleanup of the quota code
earlier in xfs_unmountfs() before the call to xfs_log_unmount(). Moving
XFS_QM_DONE() up near XFS_QM_DQPURGEALL() seems like a good spot.
SGI-PV: 987086
SGI-Modid: xfs-linux-melb:xfs-kern:32148a
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Peter Leckie <pleckie@sgi.com>
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index a4503f5..15f5dd2 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1245,6 +1245,9 @@
XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING);
+ if (mp->m_quotainfo)
+ XFS_QM_DONE(mp);
+
/*
* Flush out the log synchronously so that we know for sure
* that nothing is pinned. This is important because bflush()
@@ -1297,8 +1300,6 @@
xfs_errortag_clearall(mp, 0);
#endif
xfs_free_perag(mp);
- if (mp->m_quotainfo)
- XFS_QM_DONE(mp);
}
STATIC void