[Patch net] llc: delete timers synchronously in llc_sk_free()

[Cong Wang]

The connection timers of an llc sock could be still flying
after we delete them in llc_sk_free(), and even possibly
after we free the sock. We could just wait synchronously
here in case of troubles.

Note, I leave other call paths as they are, since they may
not have to wait, at least we can change them to synchronously
when needed.

Also, move the code to net/llc/llc_conn.c, which is apparently
a better place.

Reported-by: <syzbot+f922284c18ea23a8e...@syzkaller.appspotmail.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 include/net/llc_conn.h |  1 +
 net/llc/llc_c_ac.c     |  9 +--------
 net/llc/llc_conn.c     | 22 +++++++++++++++++++++-
 3 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/include/net/llc_conn.h b/include/net/llc_conn.h
index 5c40f118c0fa..df528a623548 100644
--- a/include/net/llc_conn.h
+++ b/include/net/llc_conn.h
@@ -97,6 +97,7 @@ static __inline__ char llc_backlog_type(struct sk_buff *skb)
 
 struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
                          struct proto *prot, int kern);
+void llc_sk_stop_all_timers(struct sock *sk, bool sync);
 void llc_sk_free(struct sock *sk);
 
 void llc_sk_reset(struct sock *sk);
diff --git a/net/llc/llc_c_ac.c b/net/llc/llc_c_ac.c
index 163121192aca..4d78375f9872 100644
--- a/net/llc/llc_c_ac.c
+++ b/net/llc/llc_c_ac.c
@@ -1099,14 +1099,7 @@ int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct 
sk_buff *skb)
 
 int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
 {
-       struct llc_sock *llc = llc_sk(sk);
-
-       del_timer(&llc->pf_cycle_timer.timer);
-       del_timer(&llc->ack_timer.timer);
-       del_timer(&llc->rej_sent_timer.timer);
-       del_timer(&llc->busy_state_timer.timer);
-       llc->ack_must_be_send = 0;
-       llc->ack_pf = 0;
+       llc_sk_stop_all_timers(sk, false);
        return 0;
 }
 
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 110e32bcb399..c0ac522b48a1 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -961,6 +961,26 @@ struct sock *llc_sk_alloc(struct net *net, int family, 
gfp_t priority, struct pr
        return sk;
 }
 
+void llc_sk_stop_all_timers(struct sock *sk, bool sync)
+{
+       struct llc_sock *llc = llc_sk(sk);
+
+       if (sync) {
+               del_timer_sync(&llc->pf_cycle_timer.timer);
+               del_timer_sync(&llc->ack_timer.timer);
+               del_timer_sync(&llc->rej_sent_timer.timer);
+               del_timer_sync(&llc->busy_state_timer.timer);
+       } else {
+               del_timer(&llc->pf_cycle_timer.timer);
+               del_timer(&llc->ack_timer.timer);
+               del_timer(&llc->rej_sent_timer.timer);
+               del_timer(&llc->busy_state_timer.timer);
+       }
+
+       llc->ack_must_be_send = 0;
+       llc->ack_pf = 0;
+}
+
 /**
  *     llc_sk_free - Frees a LLC socket
  *     @sk - socket to free
@@ -973,7 +993,7 @@ void llc_sk_free(struct sock *sk)
 
        llc->state = LLC_CONN_OUT_OF_SVC;
        /* Stop all (possibly) running timers */
-       llc_conn_ac_stop_all_timers(sk, NULL);
+       llc_sk_stop_all_timers(sk, true);
 #ifdef DEBUG_LLC_CONN_ALLOC
        printk(KERN_INFO "%s: unackq=%d, txq=%d\n", __func__,
                skb_queue_len(&llc->pdu_unack_q),
-- 
2.13.0