linux-kernel - [PATCH 4.9 055/212] Bluetooth: Prevent out-of-bounds read in hci_inquiry_result

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Message-Id: <20200820091605.150679931@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:20:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peilin Ye <yepeilin.cs@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 4.9 055/212] Bluetooth: Prevent out-of-bounds read in hci_inquiry_result_evt()

From: Peilin Ye <yepeilin.cs@...il.com>

commit 75bbd2ea50ba1c5d9da878a17e92eac02fe0fd3a upstream.

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

Cc: stable@...r.kernel.org
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/bluetooth/hci_event.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2094,7 +2094,7 @@ static void hci_inquiry_result_evt(struc
 
 	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))