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If the payload size of any K-frame exceeds the receiver's MPS, the receiver shall disconnect the channel..." This fixes L2CAP/LE/CFC/BV-27-C (running together with 'l2test -r -P 0x0027 -V le_public -I 100'). Signed-off-by: Christian Eggers Signed-off-by: Luiz Augusto von Dentz --- Note: due to lack of L2CAP CoC segmentation support in bthost the following test as expected to fail: L2CAP LE Client - Read 32k Success L2CAP LE Client - RX Timestamping 32k net/bluetooth/l2cap_core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index f550ceceb618..14131e427efd 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -6669,6 +6669,13 @@ static int l2cap_ecred_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) return -ENOBUFS; } + if (skb->len > chan->mps) { + BT_ERR("Too big LE L2CAP MPS: len %u > %u", skb->len, + chan->mps); + l2cap_send_disconn_req(chan, ECONNRESET); + return -ENOBUFS; + } + chan->rx_credits--; BT_DBG("chan %p: rx_credits %u -> %u", chan, chan->rx_credits + 1, chan->rx_credits); -- 2.52.0