netdev - [PATCH net] Bluetooth: Fix potential null pointer dereference in create_le_conn

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Date:   Fri, 13 Nov 2020 19:39:56 +0800
From:   Wang Hai <wanghai38@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <marcel@...tmann.org>,
        <johan.hedberg@...il.com>, <jpawlowski@...gle.com>
CC:     <linux-bluetooth@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net] Bluetooth: Fix potential null pointer dereference in create_le_conn_complete

The pointer 'conn' may be null. Before being used by
hci_connect_le_scan_cleanup(), The pointer 'conn' must be
checked whether it is null.

Fixes: 28a667c9c279 ("Bluetooth: advertisement handling in new connect procedure")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
 net/bluetooth/hci_conn.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index d0c1024bf600..6ca402c90ee1 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -757,6 +757,8 @@ static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 	hci_dev_lock(hdev);
 
 	conn = hci_lookup_le_connect(hdev);
+	if (!conn)
+		goto done;
 
 	if (!status) {
 		hci_connect_le_scan_cleanup(conn);
@@ -766,9 +768,6 @@ static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 	bt_dev_err(hdev, "request failed to create LE connection: "
 		   "status 0x%2.2x", status);
 
-	if (!conn)
-		goto done;
-
 	hci_le_conn_failed(conn, status);
 
 done:
-- 
2.17.1