78 lines
2.5 KiB
Diff
78 lines
2.5 KiB
Diff
From b19a194712d8f25e80d53803ccd0176f619b3fbc Mon Sep 17 00:00:00 2001
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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Date: Tue, 8 Aug 2023 10:38:26 +0000
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Subject: [PATCH 1/7] Bluetooth: L2CAP: Fix accepting connection request for
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invalid SPSM
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commit 711f8c3fb3db61897080468586b970c87c61d9e4 upstream
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Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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Date: Mon Oct 31 16:10:32 2022 -0700
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Bluetooth: L2CAP: Fix accepting connection request for invalid SPSM
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The Bluetooth spec states that the valid range for SPSM is from
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0x0001-0x00ff so it is invalid to accept values outside of this range:
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BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A
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page 1059:
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Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges
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CVE: CVE-2022-42896
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CC: stable@vger.kernel.org
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Reported-by: Tamás Koczka <poprdi@google.com>
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Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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Reviewed-by: Tedd Ho-Jeong An <tedd.an@intel.com>
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Signed-off-by: Nagappan Ramasamy Palaniappan <nagappan.ramasamy.palaniappan@oracle.com>
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Reviewed-by: Laurence Rochfort <laurence.rochfort@oracle.com>
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---
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net/bluetooth/l2cap_core.c | 25 +++++++++++++++++++++++++
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1 file changed, 25 insertions(+)
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diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
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index 86ecd4ad4..4fed6d24a 100644
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--- a/net/bluetooth/l2cap_core.c
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+++ b/net/bluetooth/l2cap_core.c
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@@ -5771,6 +5771,19 @@ static int l2cap_le_connect_req(struct l2cap_conn *conn,
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BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
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scid, mtu, mps);
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+ /* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A
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+ * page 1059:
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+ *
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+ * Valid range: 0x0001-0x00ff
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+ *
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+ * Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges
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+ */
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+ if (!psm || __le16_to_cpu(psm) > L2CAP_PSM_LE_DYN_END) {
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+ result = L2CAP_CR_LE_BAD_PSM;
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+ chan = NULL;
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+ goto response;
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+ }
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+
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/* Check if we have socket listening on psm */
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pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
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&conn->hcon->dst, LE_LINK);
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@@ -5958,6 +5971,18 @@ static inline int l2cap_ecred_conn_req(struct l2cap_conn *conn,
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psm = req->psm;
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+ /* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A
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+ * page 1059:
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+ *
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+ * Valid range: 0x0001-0x00ff
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+ *
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+ * Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges
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+ */
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+ if (!psm || __le16_to_cpu(psm) > L2CAP_PSM_LE_DYN_END) {
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+ result = L2CAP_CR_LE_BAD_PSM;
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+ goto response;
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+ }
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+
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BT_DBG("psm 0x%2.2x mtu %u mps %u", __le16_to_cpu(psm), mtu, mps);
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memset(&pdu, 0, sizeof(pdu));
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--
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2.31.1
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