From 40624183c202278e7e0edd01d1273efc87ddd1f2 Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Mon, 2 Nov 2015 14:39:17 +0200 Subject: [PATCH] Bluetooth: L2CAP: Add missing checks for invalid LE DCID When receiving a connect response we should make sure that the DCID is within the valid range and that we don't already have another channel allocated for the same DCID. Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap_core.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index fdb7989e2997..66e8b6ee19a5 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -5250,7 +5250,9 @@ static int l2cap_le_connect_rsp(struct l2cap_conn *conn, credits = __le16_to_cpu(rsp->credits); result = __le16_to_cpu(rsp->result); - if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) + if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23 || + dcid < L2CAP_CID_DYN_START || + dcid > L2CAP_CID_LE_DYN_END)) return -EPROTO; BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", @@ -5270,6 +5272,11 @@ static int l2cap_le_connect_rsp(struct l2cap_conn *conn, switch (result) { case L2CAP_CR_SUCCESS: + if (__l2cap_get_chan_by_dcid(conn, dcid)) { + err = -EBADSLT; + break; + } + chan->ident = 0; chan->dcid = dcid; chan->omtu = mtu; -- 2.20.1