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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2020-08-06 11:17:12 -0700
committerMarcel Holtmann <marcel@holtmann.org>2020-09-25 20:21:55 +0200
commitf19425641cb2572a33cb074d5e30283720bd4d22 (patch)
tree52464cf066bf118781be323cc6b3733230105a58 /net/bluetooth
parenteddb7732119d53400f48a02536a84c509692faa8 (diff)
downloadlinux-f19425641cb2572a33cb074d5e30283720bd4d22.tar.bz2
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>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap_core.c7
-rw-r--r--net/bluetooth/l2cap_sock.c14
2 files changed, 18 insertions, 3 deletions
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)