diff options
| author |   Luiz Augusto von Dentz <luiz.von.dentz@intel.com> | 2020-08-06 11:17:12 -0700 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2020-09-25 20:21:55 +0200 |
| commit | f19425641cb2572a33cb074d5e30283720bd4d22 (patch) | |
| tree | 52464cf066bf118781be323cc6b3733230105a58 | |
| parent | Bluetooth: A2MP: Fix not initializing all members (diff) | |
| download | linux-dev-f19425641cb2572a33cb074d5e30283720bd4d22.tar.xz linux-dev-f19425641cb2572a33cb074d5e30283720bd4d22.zip | |
Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel
Only sockets will have the chan->data set to an actual sk, channels
like A2MP would have its own data which would likely cause a crash when
calling sk_filter, in order to fix this a new callback has been
introduced so channels can implement their own filtering if necessary.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| -rw-r--r-- | include/net/bluetooth/l2cap.h | 2 | ||||
| -rw-r--r-- | net/bluetooth/l2cap_core.c | 7 | ||||
| -rw-r--r-- | net/bluetooth/l2cap_sock.c | 14 |
3 files changed, 20 insertions, 3 deletions
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h index 8f1e6a7a2df8..1d1232917de7 100644 --- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -665,6 +665,8 @@ struct l2cap_ops { struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan, unsigned long hdr_len, unsigned long len, int nb); + int (*filter) (struct l2cap_chan * chan, + struct sk_buff *skb); }; struct l2cap_conn { diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index ade83e224567..1ab27b90ddcb 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -7301,9 +7301,10 @@ static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) goto drop; } - if ((chan->mode == L2CAP_MODE_ERTM || - chan->mode == L2CAP_MODE_STREAMING) && sk_filter(chan->data, skb)) - goto drop; + if (chan->ops->filter) { + if (chan->ops->filter(chan, skb)) + goto drop; + } if (!control->sframe) { int err; diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index e7cfe28140c3..f1b1edd0b697 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -1664,6 +1664,19 @@ static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) sk->sk_state_change(sk); } +static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb) +{ + struct sock *sk = chan->data; + + switch (chan->mode) { + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + return sk_filter(sk, skb); + } + + return 0; +} + static const struct l2cap_ops l2cap_chan_ops = { .name = "L2CAP Socket Interface", .new_connection = l2cap_sock_new_connection_cb, @@ -1679,6 +1692,7 @@ static const struct l2cap_ops l2cap_chan_ops = { .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, .get_peer_pid = l2cap_sock_get_peer_pid_cb, .alloc_skb = l2cap_sock_alloc_skb_cb, + .filter = l2cap_sock_filter, }; static void l2cap_sock_destruct(struct sock *sk) |