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authortsutomu.owa@toshiba.co.jp <tsutomu.owa@toshiba.co.jp>2017-09-12 09:01:46 +0000
committerDavid Teigland <teigland@redhat.com>2017-09-25 12:45:21 -0500
commitccbbea04326e061651e0b38eda0792c758ce4f91 (patch)
tree7bbe3f8cfd76e83f85d0d2ba7ac953c04fef8a22 /fs/dlm/ast.c
parent3421fb15be01ff4714fed5a5d6db64849b59a1fd (diff)
downloadlinux-ccbbea04326e061651e0b38eda0792c758ce4f91.tar.bz2
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>
Diffstat (limited to 'fs/dlm/ast.c')
-rw-r--r--fs/dlm/ast.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index 07fed838d8fd..562fa8c3edff 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -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) {