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ocfs2/dlm: don't access beyond bitmap size

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dlm->recovery_map is defined as
	unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];

We should treat O2NM_MAX_NODES as the bit map size in bits.
This patches fixes a bit operation that takes O2NM_MAX_NODES + 1 as bitmap size.

Signed-off-by: Wengang Wang <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
This commit is contained in:
Wengang Wang 2010-06-30 20:23:30 +08:00 • committed by Joel Becker
commit f471c9df92
1 changed files with 1 additions and 1 deletions
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fs/ocfs2/dlm/dlmrecovery.c
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@ -463,7 +463,7 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)
if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
int bit;
bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0);
bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES, 0);
if (bit >= O2NM_MAX_NODES || bit < 0)
dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
else