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Bluetooth: Make better use of l2cap_chan reference counting

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L2CAP sockets contain a pointer to l2cap_chan that needs to be
reference counted in order to prevent a possible dangling pointer when
the channel is freed.

There were a few other cases where an l2cap_chan pointer on the stack
was dereferenced after a call to l2cap_chan_del. Those pointers are
also now reference counted.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo Padovan <gustavo@padovan.org>
This commit is contained in:
Mat Martineau
2012-04-27 16:50:50 -07:00
committed by Gustavo Padovan
parent dbd89fddc1
commit 61d6ef3e34
2 changed files with 9 additions and 0 deletions
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3
net/bluetooth/l2cap_sock.c
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@@ -956,6 +956,7 @@ static void l2cap_sock_destruct(struct sock *sk)
{
BT_DBG("sk %p", sk);
l2cap_chan_put(l2cap_pi(sk)->chan);
if (l2cap_pi(sk)->rx_busy_skb) {
kfree_skb(l2cap_pi(sk)->rx_busy_skb);
l2cap_pi(sk)->rx_busy_skb = NULL;
@@ -1057,6 +1058,8 @@ static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int p
return NULL;
}
l2cap_chan_hold(chan);
chan->sk = sk;
l2cap_pi(sk)->chan = chan;