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authorDavid Chinner <dgc@sgi.com>2006-09-27 21:06:03 -0400
committerTim Shimmin <tes@sgi.com>2006-09-27 21:06:03 -0400
commitf273ab848b7cbc0088b0ac7457b3769e6566074e (patch)
tree27f1b0ce7b056f77e7105284524cbdb658943ae5 /fs/xfs/xfs_itable.c
parent01106eae97b70399ce5a273a3cceb5246e8d9cc8 (diff)
[XFS] Really fix use after free in xfs_iunpin.
The previous attempts to fix the linux inode use-after-free in xfs_iunpin simply made the problem harder to hit. We actually need complete exclusion between xfs_reclaim and xfs_iunpin, as well as ensuring that the i_flags are consistent during both of these functions. Introduce a new spinlock for exclusion and the i_flags, and fix up xfs_iunpin to use igrab before marking the inode dirty. SGI-PV: 952967 SGI-Modid: xfs-linux-melb:xfs-kern:26964a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_itable.c')
-rw-r--r--fs/xfs/xfs_itable.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index b608b8ab1dd6..136c6b06f1c9 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -577,6 +577,7 @@ xfs_bulkstat(
577 KM_SLEEP); 577 KM_SLEEP);
578 ip->i_ino = ino; 578 ip->i_ino = ino;
579 ip->i_mount = mp; 579 ip->i_mount = mp;
580 spin_lock_init(&ip->i_flags_lock);
580 if (bp) 581 if (bp)
581 xfs_buf_relse(bp); 582 xfs_buf_relse(bp);
582 error = xfs_itobp(mp, NULL, ip, 583 error = xfs_itobp(mp, NULL, ip,