ocfs2/dlm: don't access beyond bitmap size
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 <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index f8b75ce..9dfaac7 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -463,7 +463,7 @@
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