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Bluetooth: L2CAP: Fix accepting connection request for invalid SPSM 

The Bluetooth spec states that the valid range for SPSM is from
0x0001-0x00ff so it is invalid to accept values outside of this range:

  BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A
  page 1059:
  Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges

CVE: CVE-2022-42896
CC: stable@vger.kernel.org
Reported-by: Tamás Koczka <poprdi@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Reviewed-by: Tedd Ho-Jeong An <tedd.an@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2022-10-31 16:10:32 -07:00
parent 5638d9ea9c
commit 711f8c3fb3
1 changed files with 25 additions and 0 deletions
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25
net/bluetooth/l2cap_core.c
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@ -5813,6 +5813,19 @@ static int l2cap_le_connect_req(struct l2cap_conn *conn,
BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
scid, mtu, mps);
/* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A
* page 1059:
*
* Valid range: 0x0001-0x00ff
*
* Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges
*/
if (!psm || __le16_to_cpu(psm) > L2CAP_PSM_LE_DYN_END) {
result = L2CAP_CR_LE_BAD_PSM;
chan = NULL;
goto response;
}
/* Check if we have socket listening on psm */
pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
&conn->hcon->dst, LE_LINK);
@ -6001,6 +6014,18 @@ static inline int l2cap_ecred_conn_req(struct l2cap_conn *conn,
psm = req->psm;
/* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A
* page 1059:
*
* Valid range: 0x0001-0x00ff
*
* Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges
*/
if (!psm || __le16_to_cpu(psm) > L2CAP_PSM_LE_DYN_END) {
result = L2CAP_CR_LE_BAD_PSM;
goto response;
}
BT_DBG("psm 0x%2.2x mtu %u mps %u", __le16_to_cpu(psm), mtu, mps);
memset(&pdu, 0, sizeof(pdu));