xfs: do not use unchecked extent indices in xfs_bmapi
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_bmapi.
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>
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 130ec4f..af655c1 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -4825,12 +4825,13 @@
/*
* Else go on to the next record.
*/
- ep = xfs_iext_get_ext(ifp, ++lastx);
prev = got;
- if (lastx >= nextents)
- eof = 1;
- else
+ if (++lastx < nextents) {
+ ep = xfs_iext_get_ext(ifp, lastx);
xfs_bmbt_get_all(ep, &got);
+ } else {
+ eof = 1;
+ }
}
*nmap = n;
/*