From: Cong Wang xiyou.wangcong@gmail.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@syzkaller.appspotmail.com Fixes: 304e024216a8 ("net_sched: add a temporary refcnt for struct tcindex_data") Cc: Jamal Hadi Salim jhs@mojatatu.com Cc: Jiri Pirko jiri@resnulli.us Cc: Paul E. McKenney paulmck@kernel.org Signed-off-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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;