netdev - [Linux-kernel-mentees] [PATCH 1/2] net/bluetooth: Prevent out-of-bounds read in hci_inquiry_result

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Message-Id: <3f69f09d6eb0bc1430cae2894c635252a1cb09e1.1594414498.git.yepeilin.cs@gmail.com>
Date:   Fri, 10 Jul 2020 17:39:18 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH 1/2] net/bluetooth: Prevent out-of-bounds read in hci_inquiry_result_evt()

Check `num_rsp` before using it as for-loop counter.

Cc: stable@...r.kernel.org
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
 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 03a0759f2fc2..8b3736c83b8e 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2517,7 +2517,7 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
 	BT_DBG("%s num_rsp %d", hdev->name, num_rsp);
 
-	if (!num_rsp)
+	if (!num_rsp || skb->len < num_rsp * sizeof(*info) + 1)
 		return;
 
 	if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ))
-- 
2.25.1