diff options
| author | David Chinner <dgc@sgi.com> | 2006-09-28 05:06:03 +0400 |
|---|---|---|
| committer | Tim Shimmin <tes@sgi.com> | 2006-09-28 05:06:03 +0400 |
| commit | f273ab848b7cbc0088b0ac7457b3769e6566074e (patch) | |
| tree | 27f1b0ce7b056f77e7105284524cbdb658943ae5 /fs/xfs/xfs_iget.c | |
| parent | 01106eae97b70399ce5a273a3cceb5246e8d9cc8 (diff) | |
| download | linux-f273ab848b7cbc0088b0ac7457b3769e6566074e.tar.xz | |
[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_iget.c')
| -rw-r--r-- | fs/xfs/xfs_iget.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index 9b9379792f37..b73d216ecaf9 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -243,7 +243,9 @@ again: XFS_STATS_INC(xs_ig_found); + spin_lock(&ip->i_flags_lock); ip->i_flags &= ~XFS_IRECLAIMABLE; + spin_unlock(&ip->i_flags_lock); version = ih->ih_version; read_unlock(&ih->ih_lock); xfs_ihash_promote(ih, ip, version); @@ -297,7 +299,9 @@ finish_inode: if (lock_flags != 0) xfs_ilock(ip, lock_flags); + spin_lock(&ip->i_flags_lock); ip->i_flags &= ~XFS_ISTALE; + spin_unlock(&ip->i_flags_lock); vn_trace_exit(vp, "xfs_iget.found", (inst_t *)__return_address); @@ -367,7 +371,9 @@ finish_inode: ih->ih_next = ip; ip->i_udquot = ip->i_gdquot = NULL; ih->ih_version++; + spin_lock(&ip->i_flags_lock); ip->i_flags |= XFS_INEW; + spin_unlock(&ip->i_flags_lock); write_unlock(&ih->ih_lock); |