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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH] Bluetooth: hci_event: Fix checking for invalid handle on error status
Date:   Wed, 20 Apr 2022 15:14:33 -0700
Message-Id: <20220420221433.2933868-1-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Commit d5ebaa7c5f6f6 introduces checks for handle range
(e.g HCI_CONN_HANDLE_MAX) but controllers don't seem to respect the
valid range int case of error status:

> HCI Event: Connect Complete (0x03) plen 11
        Status: Page Timeout (0x04)
        Handle: 65535
        Address: 94:DB:56:XX:XX:XX (Sony Home Entertainment&
	Sound Products Inc)
        Link type: ACL (0x01)
        Encryption: Disabled (0x00)
[1644965.827560] Bluetooth: hci0: Ignoring HCI_Connection_Complete for
invalid handle

Because of it is impossible to cleanup the connections properly since
the stack would attempt to cancel the connection which is no longer in
progress causing the following trace:

< HCI Command: Create Connection Cancel (0x01|0x0008) plen 6
        Address: 94:DB:56:XX:XX:XX (Sony Home Entertainment&
	Sound Products Inc)
= bluetoothd: src/profile.c:record_cb() Unable to get Hands-Free Voice
	gateway SDP record: Connection timed out
> HCI Event: Command Complete (0x0e) plen 10
      Create Connection Cancel (0x01|0x0008) ncmd 1
        Status: Unknown Connection Identifier (0x02)
        Address: 94:DB:56:XX:XX:XX (Sony Home Entertainment&
	Sound Products Inc)
< HCI Command: Create Connection Cancel (0x01|0x0008) plen 6
        Address: 94:DB:56:XX:XX:XX (Sony Home Entertainment&
	Sound Products Inc)

Fixes: d5ebaa7c5f6f6 ("Bluetooth: hci_event: Ignore multiple conn complete events")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/hci_event.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index abaabfae19cc..1cc5a712459e 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3068,7 +3068,7 @@ 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) {
+	if (!status && __le16_to_cpu(ev->handle) > HCI_CONN_HANDLE_MAX) {
 		bt_dev_err(hdev, "Ignoring HCI_Connection_Complete for invalid handle");
 		return;
 	}
@@ -4690,7 +4690,7 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev, void *data,
 		return;
 	}
 
-	if (__le16_to_cpu(ev->handle) > HCI_CONN_HANDLE_MAX) {
+	if (!status && __le16_to_cpu(ev->handle) > HCI_CONN_HANDLE_MAX) {
 		bt_dev_err(hdev, "Ignoring HCI_Sync_Conn_Complete for invalid handle");
 		return;
 	}
@@ -5527,7 +5527,7 @@ 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) {
+	if (!status && handle > HCI_CONN_HANDLE_MAX) {
 		bt_dev_err(hdev, "Ignoring HCI_LE_Connection_Complete for invalid handle");
 		return;
 	}
-- 
2.35.1