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Date: Sat, 11 Apr 2020 14:09:28 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, syzbot+8325e509a1bf83ec741d@...kaller.appspotmail.com, Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>, "Paul E. McKenney" <paulmck@...nel.org>, Cong Wang <xiyou.wangcong@...il.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 5.5 08/44] net_sched: fix a missing refcnt in tcindex_init() From: Cong Wang <xiyou.wangcong@...il.com> [ Upstream commit a8eab6d35e22f4f21471f16147be79529cd6aaf7 ] The initial refcnt of struct tcindex_data should be 1, it is clear that I forgot to set it to 1 in tcindex_init(). This leads to a dec-after-zero warning. Reported-by: syzbot+8325e509a1bf83ec741d@...kaller.appspotmail.com Fixes: 304e024216a8 ("net_sched: add a temporary refcnt for struct tcindex_data") Cc: Jamal Hadi Salim <jhs@...atatu.com> Cc: Jiri Pirko <jiri@...nulli.us> Cc: Paul E. McKenney <paulmck@...nel.org> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/sched/cls_tcindex.c | 1 + 1 file changed, 1 insertion(+) --- a/net/sched/cls_tcindex.c +++ b/net/sched/cls_tcindex.c @@ -151,6 +151,7 @@ static int tcindex_init(struct tcf_proto p->mask = 0xffff; p->hash = DEFAULT_HASH_SIZE; p->fall_through = 1; + refcount_set(&p->refcnt, 1); /* Paired with tcindex_destroy_work() */ rcu_assign_pointer(tp->root, p); return 0;
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