linux-kernel - [PATCH v1] Bluetooth: send proper config param to unknown config request

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Message-Id: <20200924234422.v1.1.Id1d24a896cd1d20f9ce7a4eb74523fe7896af89d@changeid>
Date:   Thu, 24 Sep 2020 23:45:01 +0800
From:   Archie Pusaka <apusaka@...gle.com>
To:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>
Cc:     CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v1] Bluetooth: send proper config param to unknown config request

From: Archie Pusaka <apusaka@...omium.org>

When receiving an L2CAP_CONFIGURATION_REQ with an unknown config
type, currently we will reply with L2CAP_CONFIGURATION_RSP with
a list of unknown types as the config param. However, this is not
a correct format of config param.

As described in the bluetooth spec v5.2, Vol 3, Part A, Sec 5,
the config param should consists of type, length, and optionally
data.

This patch copies the length and data from the received
L2CAP_CONFIGURATION_REQ and also appends them to the config param
of the corresponding L2CAP_CONFIGURATION_RSP to match the format
of the config param according to the spec.

Signed-off-by: Archie Pusaka <apusaka@...omium.org>
Reviewed-by: Alain Michaud <alainm@...omium.org>

---

 net/bluetooth/l2cap_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index ade83e224567..2f3ddd4f0f4c 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -3627,7 +3627,8 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data
 			if (hint)
 				break;
 			result = L2CAP_CONF_UNKNOWN;
-			*((u8 *) ptr++) = type;
+			l2cap_add_conf_opt(&ptr, type, olen, val,
+					   endptr - ptr);
 			break;
 		}
 	}
@@ -3658,7 +3659,7 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data
 	}
 
 done:
-	if (chan->mode != rfc.mode) {
+	if (chan->mode != rfc.mode && result != L2CAP_CONF_UNKNOWN) {
 		result = L2CAP_CONF_UNACCEPT;
 		rfc.mode = chan->mode;
 
-- 
2.28.0.681.g6f77f65b4e-goog