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Bluetooth: L2CAP: Add missing checks for invalid DCID

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[ Upstream commit 75767213f3 ]

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.
Missing checks may violate the specification (BLUETOOTH CORE SPECIFICATION
Version 5.4 | Vol 3, Part A, Page 1046).

Fixes: 40624183c2 ("Bluetooth: L2CAP: Add missing checks for invalid LE DCID")
Signed-off-by: Sungwoo Kim <iam@sung-woo.kim>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sungwoo Kim
2023-06-03 08:28:09 -04:00
committed by Greg Kroah-Hartman
parent 53c056ccda
commit 668c3f9514
1 changed files with 9 additions and 0 deletions
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9
net/bluetooth/l2cap_core.c
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@@ -4307,6 +4307,10 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
result = __le16_to_cpu(rsp->result);
status = __le16_to_cpu(rsp->status);
if (result == L2CAP_CR_SUCCESS && (dcid < L2CAP_CID_DYN_START ||
dcid > L2CAP_CID_DYN_END))
return -EPROTO;
BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
dcid, scid, result, status);
@@ -4338,6 +4342,11 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
switch (result) {
case L2CAP_CR_SUCCESS:
if (__l2cap_get_chan_by_dcid(conn, dcid)) {
err = -EBADSLT;
break;
}
l2cap_state_change(chan, BT_CONFIG);
chan->ident = 0;
chan->dcid = dcid;