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xfs: do not use unchecked extent indices in xfs_bunmapi 

Make sure to only call xfs_iext_get_ext after we've validate the
extent index when moving on to the next index in xfs_bunmapi.  Also
remove the old workaround for too large indices that has been
superceeded by the proper fix in xfs_bmap_del_extent.

Based on an earlier patch from Lachlan McIlroy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lachlan McIlroy <lmcilroy@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-05-11 15:04:08 +00:00 committed by Alex Elder
parent 5690f92199
commit 00239acf36
1 changed files with 8 additions and 8 deletions
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16
fs/xfs/xfs_bmap.c
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@ -5242,17 +5242,17 @@ xfs_bunmapi(
nodelete:
/*
* If not done go on to the next (previous) record.
* Reset ep in case the extents array was re-alloced.
*/
ep = xfs_iext_get_ext(ifp, lastx);
if (bno != (xfs_fileoff_t)-1 && bno >= start) {
if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
xfs_bmbt_get_startoff(ep) > bno) {
if (--lastx >= 0)
ep = xfs_iext_get_ext(ifp, lastx);
}
if (lastx >= 0)
if (lastx >= 0) {
ep = xfs_iext_get_ext(ifp, lastx);
if (xfs_bmbt_get_startoff(ep) > bno) {
if (--lastx >= 0)
ep = xfs_iext_get_ext(ifp,
lastx);
}
xfs_bmbt_get_all(ep, &got);
}
extno++;
}
}