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Diffstat (limited to 'net/bluetooth/hci_event.c')
-rw-r--r--net/bluetooth/hci_event.c89
1 files changed, 68 insertions, 21 deletions
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index fc30f4c03d29..63b925921c87 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3068,6 +3068,11 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
struct hci_ev_conn_complete *ev = data;
struct hci_conn *conn;
+ if (__le16_to_cpu(ev->handle) > HCI_CONN_HANDLE_MAX) {
+ bt_dev_err(hdev, "Ignoring HCI_Connection_Complete for invalid handle");
+ return;
+ }
+
bt_dev_dbg(hdev, "status 0x%2.2x", ev->status);
hci_dev_lock(hdev);
@@ -3106,6 +3111,17 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
}
}
+ /* The HCI_Connection_Complete event is only sent once per connection.
+ * Processing it more than once per connection can corrupt kernel memory.
+ *
+ * As the connection handle is set here for the first time, it indicates
+ * whether the connection is already set up.
+ */
+ if (conn->handle != HCI_CONN_HANDLE_UNSET) {
+ bt_dev_err(hdev, "Ignoring HCI_Connection_Complete for existing connection");
+ goto unlock;
+ }
+
if (!ev->status) {
conn->handle = __le16_to_cpu(ev->handle);
@@ -4534,7 +4550,7 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev, void *edata,
if (!info) {
bt_dev_err(hdev, "Malformed HCI Event: 0x%2.2x",
HCI_EV_INQUIRY_RESULT_WITH_RSSI);
- return;
+ goto unlock;
}
bacpy(&data.bdaddr, &info->bdaddr);
@@ -4565,7 +4581,7 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev, void *edata,
if (!info) {
bt_dev_err(hdev, "Malformed HCI Event: 0x%2.2x",
HCI_EV_INQUIRY_RESULT_WITH_RSSI);
- return;
+ goto unlock;
}
bacpy(&data.bdaddr, &info->bdaddr);
@@ -4587,7 +4603,7 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev, void *edata,
bt_dev_err(hdev, "Malformed HCI Event: 0x%2.2x",
HCI_EV_INQUIRY_RESULT_WITH_RSSI);
}
-
+unlock:
hci_dev_unlock(hdev);
}
@@ -4661,6 +4677,24 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev, void *data,
struct hci_ev_sync_conn_complete *ev = data;
struct hci_conn *conn;
+ switch (ev->link_type) {
+ case SCO_LINK:
+ case ESCO_LINK:
+ break;
+ default:
+ /* As per Core 5.3 Vol 4 Part E 7.7.35 (p.2219), Link_Type
+ * for HCI_Synchronous_Connection_Complete is limited to
+ * either SCO or eSCO
+ */
+ bt_dev_err(hdev, "Ignoring connect complete event for invalid link type");
+ return;
+ }
+
+ if (__le16_to_cpu(ev->handle) > HCI_CONN_HANDLE_MAX) {
+ bt_dev_err(hdev, "Ignoring HCI_Sync_Conn_Complete for invalid handle");
+ return;
+ }
+
bt_dev_dbg(hdev, "status 0x%2.2x", ev->status);
hci_dev_lock(hdev);
@@ -4684,23 +4718,19 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev, void *data,
goto unlock;
}
+ /* The HCI_Synchronous_Connection_Complete event is only sent once per connection.
+ * Processing it more than once per connection can corrupt kernel memory.
+ *
+ * As the connection handle is set here for the first time, it indicates
+ * whether the connection is already set up.
+ */
+ if (conn->handle != HCI_CONN_HANDLE_UNSET) {
+ bt_dev_err(hdev, "Ignoring HCI_Sync_Conn_Complete event for existing connection");
+ goto unlock;
+ }
+
switch (ev->status) {
case 0x00:
- /* The synchronous connection complete event should only be
- * sent once per new connection. Receiving a successful
- * complete event when the connection status is already
- * BT_CONNECTED means that the device is misbehaving and sent
- * multiple complete event packets for the same new connection.
- *
- * Registering the device more than once can corrupt kernel
- * memory, hence upon detecting this invalid event, we report
- * an error and ignore the packet.
- */
- if (conn->state == BT_CONNECTED) {
- bt_dev_err(hdev, "Ignoring connect complete event for existing connection");
- goto unlock;
- }
-
conn->handle = __le16_to_cpu(ev->handle);
conn->state = BT_CONNECTED;
conn->type = ev->link_type;
@@ -5496,6 +5526,11 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status,
struct smp_irk *irk;
u8 addr_type;
+ if (handle > HCI_CONN_HANDLE_MAX) {
+ bt_dev_err(hdev, "Ignoring HCI_LE_Connection_Complete for invalid handle");
+ return;
+ }
+
hci_dev_lock(hdev);
/* All controllers implicitly stop advertising in the event of a
@@ -5537,6 +5572,17 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status,
cancel_delayed_work(&conn->le_conn_timeout);
}
+ /* The HCI_LE_Connection_Complete event is only sent once per connection.
+ * Processing it more than once per connection can corrupt kernel memory.
+ *
+ * As the connection handle is set here for the first time, it indicates
+ * whether the connection is already set up.
+ */
+ if (conn->handle != HCI_CONN_HANDLE_UNSET) {
+ bt_dev_err(hdev, "Ignoring HCI_Connection_Complete for existing connection");
+ goto unlock;
+ }
+
le_conn_update_addr(conn, bdaddr, bdaddr_type, local_rpa);
/* Lookup the identity address from the stored connection
@@ -6798,7 +6844,7 @@ static const struct hci_ev {
HCI_EV(HCI_EV_NUM_COMP_BLOCKS, hci_num_comp_blocks_evt,
sizeof(struct hci_ev_num_comp_blocks)),
/* [0xff = HCI_EV_VENDOR] */
- HCI_EV(HCI_EV_VENDOR, msft_vendor_evt, 0),
+ HCI_EV_VL(HCI_EV_VENDOR, msft_vendor_evt, 0, HCI_MAX_EVENT_SIZE),
};
static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb,
@@ -6823,8 +6869,9 @@ static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb,
* decide if that is acceptable.
*/
if (skb->len > ev->max_len)
- bt_dev_warn(hdev, "unexpected event 0x%2.2x length: %u > %u",
- event, skb->len, ev->max_len);
+ bt_dev_warn_ratelimited(hdev,
+ "unexpected event 0x%2.2x length: %u > %u",
+ event, skb->len, ev->max_len);
data = hci_ev_skb_pull(hdev, skb, event, ev->min_len);
if (!data)
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-16 00:24:42 +0300