From: David Chinner <dgc@sgi.com>
Date: Thu, 28 Sep 2006 01:06:03 +0000 (+1000)
Subject: [XFS] Really fix use after free in xfs_iunpin.
X-Git-Tag: v2.6.19-rc1~653^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f273ab848b7cbc0088b0ac7457b3769e6566074e;p=pandora-kernel.git

[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>
---

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