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Date: Mon, 19 Oct 2020 17:02:46 -0000
From: "tip-bot2 for Luiz Augusto von Dentz" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
Marcel Holtmann <marcel@...tmann.org>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/urgent] Bluetooth: L2CAP: Fix calling sk_filter on
non-socket based channel
The following commit has been merged into the perf/urgent branch of tip:
Commit-ID: 3dede8ebf46338473143a1e792cc2cacc244f1f2
Gitweb: https://git.kernel.org/tip/3dede8ebf46338473143a1e792cc2cacc244f1f2
Author: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
AuthorDate: Thu, 06 Aug 2020 11:17:12 -07:00
Committer: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CommitterDate: Sat, 17 Oct 2020 08:31:21 +02:00
Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel
commit f19425641cb2572a33cb074d5e30283720bd4d22 upstream.
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@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
include/net/bluetooth/l2cap.h | 2 ++
net/bluetooth/l2cap_core.c | 7 ++++---
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 8f1e6a7..1d12329 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 ade83e2..1ab27b9 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 e1a3e66..79b4c01 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1663,6 +1663,19 @@ 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,
@@ -1678,6 +1691,7 @@ 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)
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