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[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>
This commit is contained in:
Lachlan McIlroy 2008-10-30 16:53:25 +11:00 committed by Lachlan McIlroy
parent 75fa67706c
commit 9ccbece546
1 changed files with 3 additions and 2 deletions
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5
fs/xfs/xfs_mount.c
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@ -1245,6 +1245,9 @@ xfs_unmountfs(
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_unmountfs(
xfs_errortag_clearall(mp, 0);
#endif
xfs_free_perag(mp);
if (mp->m_quotainfo)
XFS_QM_DONE(mp);
}
STATIC void