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Commit f471c9df authored by Wengang Wang's avatar Wengang Wang Committed by Joel Becker
Browse files

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: default avatarWengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
parent 693c241a

fs/ocfs2/dlm/dlmrecovery.c

+1 −1
Original line number Diff line number Diff line
@@ -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