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authorAndrei Emeltchenko <andrei.emeltchenko@nokia.com>2010-11-03 12:32:45 +0200
committerGustavo F. Padovan <padovan@profusion.mobi>2010-12-01 21:04:36 -0200
commit940a9eea80946b64b96bd8af1fc71b30c602d057 (patch)
treeceea6a628b9692f727c1c68439fbe730921d7220 /net/bluetooth
parenta49184c229535ebedbb659214db2d4d1d77b7c07 (diff)
downloadblackbird-op-linux-940a9eea80946b64b96bd8af1fc71b30c602d057.tar.gz
blackbird-op-linux-940a9eea80946b64b96bd8af1fc71b30c602d057.zip
Bluetooth: timer check sk is not owned before freeing
In timer context we might delete l2cap channel used by krfcommd. The check makes sure that sk is not owned. If sk is owned we restart timer for HZ/5. Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@nokia.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 4ed38272df78..18a802cc0469 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -83,6 +83,18 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
/* ---- L2CAP timers ---- */
+static void l2cap_sock_set_timer(struct sock *sk, long timeout)
+{
+ BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
+ sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
+}
+
+static void l2cap_sock_clear_timer(struct sock *sk)
+{
+ BT_DBG("sock %p state %d", sk, sk->sk_state);
+ sk_stop_timer(sk, &sk->sk_timer);
+}
+
static void l2cap_sock_timeout(unsigned long arg)
{
struct sock *sk = (struct sock *) arg;
@@ -92,6 +104,14 @@ static void l2cap_sock_timeout(unsigned long arg)
bh_lock_sock(sk);
+ if (sock_owned_by_user(sk)) {
+ /* sk is owned by user. Try again later */
+ l2cap_sock_set_timer(sk, HZ / 5);
+ bh_unlock_sock(sk);
+ sock_put(sk);
+ return;
+ }
+
if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
reason = ECONNREFUSED;
else if (sk->sk_state == BT_CONNECT &&
@@ -108,18 +128,6 @@ static void l2cap_sock_timeout(unsigned long arg)
sock_put(sk);
}
-static void l2cap_sock_set_timer(struct sock *sk, long timeout)
-{
- BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
- sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
-}
-
-static void l2cap_sock_clear_timer(struct sock *sk)
-{
- BT_DBG("sock %p state %d", sk, sk->sk_state);
- sk_stop_timer(sk, &sk->sk_timer);
-}
-
/* ---- L2CAP channels ---- */
static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
{
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