From: Christian Eggers <ceggers@arri.de>
Date: Wed, 25 Feb 2026 17:07:27 +0000 (+0100)
Subject: Bluetooth: LE L2CAP: Disconnect if sum of payload sizes exceed SDU
X-Git-Tag: v7.0-rc5~31^2~32^2~10
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b6a2bf43aa37670432843bc73ae2a6288ba4d6f8;p=thirdparty%2Flinux.git

Bluetooth: LE L2CAP: Disconnect if sum of payload sizes exceed SDU

Core 6.0, Vol 3, Part A, 3.4.3:
"... If the sum of the payload sizes for the K-frames exceeds the
specified SDU length, the receiver shall disconnect the channel."

This fixes L2CAP/LE/CFC/BV-27-C (running together with 'l2test -r -P
0x0027 -V le_public').

Fixes: aac23bf63659 ("Bluetooth: Implement LE L2CAP reassembly")
Signed-off-by: Christian Eggers <ceggers@arri.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 3056dcd5fa2f..0f400051f093 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -6729,6 +6729,7 @@ static int l2cap_ecred_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
 
 	if (chan->sdu->len + skb->len > chan->sdu_len) {
 		BT_ERR("Too much LE L2CAP data received");
+		l2cap_send_disconn_req(chan, ECONNRESET);
 		err = -EINVAL;
 		goto failed;
 	}