netdev - [PATCH v2] Bluetooth: Ignore too large handle values in BIG

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Date: Mon, 17 Jun 2024 19:09:37 +0800
From: Edward Adam Davis <eadavis@...com>
To: pmenzel@...gen.mpg.de
Cc: davem@...emloft.net,
	eadavis@...com,
	edumazet@...gle.com,
	johan.hedberg@...il.com,
	kuba@...nel.org,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	luiz.dentz@...il.com,
	luiz.von.dentz@...el.com,
	marcel@...tmann.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	syzkaller-bugs@...glegroups.com,
	william.xuanziyang@...wei.com
Subject: [PATCH v2] Bluetooth: Ignore too large handle values in BIG

hci_le_big_sync_established_evt is necessary to filter out cases where the
handle value is belonging to ida id range, otherwise ida will be erroneously
released in hci_conn_cleanup.

Fixes: 181a42edddf5 ("Bluetooth: Make handle of hci_conn be unique")
Reported-by: syzbot+b2545b087a01a7319474@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b2545b087a01a7319474
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 net/bluetooth/hci_event.c | 4 +++
 1 file changed, 4 insertions(+)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index a487f9df8145..3966fbc38df9 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -6893,6 +6893,10 @@ static void hci_le_big_sync_established_evt(struct hci_dev *hdev, void *data,
 
 		bis = hci_conn_hash_lookup_handle(hdev, handle);
 		if (!bis) {
+			if (handle > HCI_CONN_HANDLE_MAX) {
+				bt_dev_dbg(hdev, "ignore too large handle %u", handle);
+				continue;
+			}
 			bis = hci_conn_add(hdev, ISO_LINK, BDADDR_ANY,
 					   HCI_ROLE_SLAVE, handle);
 			if (IS_ERR(bis))
-- 
2.43.0