From 8a6e77d5209e459a9ec5c268c39800c06cd1dc86 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 21 Nov 2011 00:21:55 +0000 Subject: [PATCH] decnet: proper socket refcounting Better use sk_reset_timer() / sk_stop_timer() helpers to make sure we dont access already freed/reused memory later. Reported-by: Sasha Levin Signed-off-by: Eric Dumazet Tested-by: Sasha Levin Signed-off-by: David S. Miller --- net/decnet/dn_timer.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/net/decnet/dn_timer.c b/net/decnet/dn_timer.c index 67f691bd4acf..d9c150cc59a9 100644 --- a/net/decnet/dn_timer.c +++ b/net/decnet/dn_timer.c @@ -36,16 +36,13 @@ static void dn_slow_timer(unsigned long arg); void dn_start_slow_timer(struct sock *sk) { - sk->sk_timer.expires = jiffies + SLOW_INTERVAL; - sk->sk_timer.function = dn_slow_timer; - sk->sk_timer.data = (unsigned long)sk; - - add_timer(&sk->sk_timer); + setup_timer(&sk->sk_timer, dn_slow_timer, (unsigned long)sk); + sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); } void dn_stop_slow_timer(struct sock *sk) { - del_timer(&sk->sk_timer); + sk_stop_timer(sk, &sk->sk_timer); } static void dn_slow_timer(unsigned long arg) @@ -53,12 +50,10 @@ static void dn_slow_timer(unsigned long arg) struct sock *sk = (struct sock *)arg; struct dn_scp *scp = DN_SK(sk); - sock_hold(sk); bh_lock_sock(sk); if (sock_owned_by_user(sk)) { - sk->sk_timer.expires = jiffies + HZ / 10; - add_timer(&sk->sk_timer); + sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 10); goto out; } @@ -100,9 +95,7 @@ static void dn_slow_timer(unsigned long arg) scp->keepalive_fxn(sk); } - sk->sk_timer.expires = jiffies + SLOW_INTERVAL; - - add_timer(&sk->sk_timer); + sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); out: bh_unlock_sock(sk); sock_put(sk);