linux-kernel - [PATCH] Bluetooth: msft: fix null pointer deref on msft_monitor_device

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Date:   Sat, 22 Jan 2022 09:27:52 +0100
From:   Soenke Huster <soenke.huster@...oes.de>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Soenke Huster <soenke.huster@...oes.de>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: msft: fix null pointer deref on msft_monitor_device_evt

msft_find_handle_data returns NULL if it can't find the handle.
Therefore, handle_data must be checked, otherwise a null pointer
is dereferenced.

Signed-off-by: Soenke Huster <soenke.huster@...oes.de>
---
 net/bluetooth/msft.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
index 484540855863..d2cf92e834f7 100644
--- a/net/bluetooth/msft.c
+++ b/net/bluetooth/msft.c
@@ -705,6 +705,9 @@ static void msft_monitor_device_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
 	handle_data = msft_find_handle_data(hdev, ev->monitor_handle, false);
 
+	if (!handle_data)
+		return;
+
 	switch (ev->addr_type) {
 	case ADDR_LE_DEV_PUBLIC:
 		addr_type = BDADDR_LE_PUBLIC;
-- 
2.34.1