netrom: switch to sock timer API

[ Upstream commit 63346650c1a94a92be61a57416ac88c0a47c4327 ]

sk_reset_timer() and sk_stop_timer() properly handle
sock refcnt for timer function. Switching to them
could fix a refcounting bug reported by syzbot.

Reported-and-tested-by: syzbot+defa700d16f1bd1b9a05@syzkaller.appspotmail.com
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-hams@vger.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>

diff --git a/net/netrom/nr_timer.c b/net/netrom/nr_timer.c
index 94d0580..f0ecaec 100644 (file)
--- a/net/netrom/nr_timer.c
+++ b/net/netrom/nr_timer.c
@@ -53,21 +53,21 @@ void nr_start_t1timer(struct sock *sk)
 {
        struct nr_sock *nr = nr_sk(sk);
 
-       mod_timer(&nr->t1timer, jiffies + nr->t1);
+       sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
 }
 
 void nr_start_t2timer(struct sock *sk)
 {
        struct nr_sock *nr = nr_sk(sk);
 
-       mod_timer(&nr->t2timer, jiffies + nr->t2);
+       sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
 }
 
 void nr_start_t4timer(struct sock *sk)
 {
        struct nr_sock *nr = nr_sk(sk);
 
-       mod_timer(&nr->t4timer, jiffies + nr->t4);
+       sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
 }
 
 void nr_start_idletimer(struct sock *sk)
@@ -75,37 +75,37 @@ void nr_start_idletimer(struct sock *sk)
        struct nr_sock *nr = nr_sk(sk);
 
        if (nr->idle > 0)
-               mod_timer(&nr->idletimer, jiffies + nr->idle);
+               sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
 }
 
 void nr_start_heartbeat(struct sock *sk)
 {
-       mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
+       sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
 }
 
 void nr_stop_t1timer(struct sock *sk)
 {
-       del_timer(&nr_sk(sk)->t1timer);
+       sk_stop_timer(sk, &nr_sk(sk)->t1timer);
 }
 
 void nr_stop_t2timer(struct sock *sk)
 {
-       del_timer(&nr_sk(sk)->t2timer);
+       sk_stop_timer(sk, &nr_sk(sk)->t2timer);
 }
 
 void nr_stop_t4timer(struct sock *sk)
 {
-       del_timer(&nr_sk(sk)->t4timer);
+       sk_stop_timer(sk, &nr_sk(sk)->t4timer);
 }
 
 void nr_stop_idletimer(struct sock *sk)
 {
-       del_timer(&nr_sk(sk)->idletimer);
+       sk_stop_timer(sk, &nr_sk(sk)->idletimer);
 }
 
 void nr_stop_heartbeat(struct sock *sk)
 {
-       del_timer(&sk->sk_timer);
+       sk_stop_timer(sk, &sk->sk_timer);
 }
 
 int nr_t1timer_running(struct sock *sk)