[PATCH 6.9 097/197] bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX

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6.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pavel Skripkin <paskripkin@xxxxxxxxx>

[ Upstream commit 1cc18c2ab2e8c54c355ea7c0423a636e415a0c23 ]

Syzbot hit warning in hci_conn_del() caused by freeing handle that was
not allocated using ida allocator.

This is caused by handle bigger than HCI_CONN_HANDLE_MAX passed by
hci_le_big_sync_established_evt(), which makes code think it's unset
connection.

Add same check for handle upper bound as in hci_conn_set_handle() to
prevent warning.

Link: https://syzkaller.appspot.com/bug?extid=b2545b087a01a7319474
Reported-by: syzbot+b2545b087a01a7319474@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 181a42edddf5 ("Bluetooth: Make handle of hci_conn be unique")
Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/bluetooth/hci_conn.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 08ae30fd31551..baca48ce8d0c6 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -904,8 +904,8 @@ static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
 			       U16_MAX, GFP_ATOMIC);
 }
 
-struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
-			      u8 role, u16 handle)
+static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
+				       u8 role, u16 handle)
 {
 	struct hci_conn *conn;
 
@@ -1046,7 +1046,16 @@ struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
 	if (unlikely(handle < 0))
 		return ERR_PTR(-ECONNREFUSED);
 
-	return hci_conn_add(hdev, type, dst, role, handle);
+	return __hci_conn_add(hdev, type, dst, role, handle);
+}
+
+struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
+			      u8 role, u16 handle)
+{
+	if (handle > HCI_CONN_HANDLE_MAX)
+		return ERR_PTR(-EINVAL);
+
+	return __hci_conn_add(hdev, type, dst, role, handle);
 }
 
 static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
-- 
2.43.0







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