Commit ccbbea04 authored Sep 12, 2017 by tsutomu.owa@toshiba.co.jp Committed by David Teigland Sep 25, 2017

DLM: fix overflow dlm_cb_seq



dlm_cb_seq is 64 bits. If dlm_cb_seq overflows and returns to 0,
dlm_rem_lkb_callback() will not work properly.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

parent 3421fb15

fs/dlm/ast.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -181,6 +181,8 @@ void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,

		spin_lock(&dlm_cb_seq_spin);
		new_seq = ++dlm_cb_seq;
		if (!dlm_cb_seq)
		new_seq = ++dlm_cb_seq;
		spin_unlock(&dlm_cb_seq_spin);

		if (lkb->lkb_flags & DLM_IFL_USER) {