netdev - [PATCH] bluetooth: fix uninitialized variables notify

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Date:   Mon, 15 Nov 2021 16:56:13 +0800
From:   Jackie Liu <liu.yun@...ux.dev>
To:     chethan.tumkur.narayan@...el.com, marcel@...tmann.org,
        luiz.dentz@...il.com
Cc:     linux-bluetooth@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: [PATCH] bluetooth: fix uninitialized variables notify_evt

From: Jackie Liu <liuyun01@...inos.cn>

Coverity Scan report:

[...]
*** CID 1493985:  Uninitialized variables  (UNINIT)
/net/bluetooth/hci_event.c: 4535 in hci_sync_conn_complete_evt()
4529
4530     	/* Notify only in case of SCO over HCI transport data path which
4531     	 * is zero and non-zero value shall be non-HCI transport data path
4532     	 */
4533     	if (conn->codec.data_path == 0) {
4534     		if (hdev->notify)
>>>     CID 1493985:  Uninitialized variables  (UNINIT)
>>>     Using uninitialized value "notify_evt" when calling "*hdev->notify".
4535     			hdev->notify(hdev, notify_evt);
4536     	}
4537
4538     	hci_connect_cfm(conn, ev->status);
4539     	if (ev->status)
4540     		hci_conn_del(conn);
[...]

Although only btusb uses air_mode, and he only handles HCI_NOTIFY_ENABLE_SCO_CVSD
and HCI_NOTIFY_ENABLE_SCO_TRANSP, there is still a very small chance that
ev->air_mode is not equal to 0x2 and 0x3, but notify_evt is initialized to
HCI_NOTIFY_ENABLE_SCO_CVSD or HCI_NOTIFY_ENABLE_SCO_TRANSP. the context is
maybe not correct.

In order to ensure 100% correctness, we directly give him a default value 0.

Addresses-Coverity: ("Uninitialized variables")
Fixes: f4f9fa0c07bb ("Bluetooth: Allow usb to auto-suspend when SCO use	non-HCI transport")
Signed-off-by: Jackie Liu <liuyun01@...inos.cn>
---
 net/bluetooth/hci_event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 7d0db1ca1248..f898fa42a183 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4445,7 +4445,7 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev,
 {
 	struct hci_ev_sync_conn_complete *ev = (void *) skb->data;
 	struct hci_conn *conn;
-	unsigned int notify_evt;
+	unsigned int notify_evt = 0;
 
 	BT_DBG("%s status 0x%2.2x", hdev->name, ev->status);
 
-- 
2.25.1