linux-kernel - [PATCH 4.19 10/48] Bluetooth: Prevent out-of-bounds read in hci_inquiry_result_with_rssi

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Message-Id: <20200810151804.717015492@linuxfoundation.org>
Date:   Mon, 10 Aug 2020 17:21:32 +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 4.19 10/48] Bluetooth: Prevent out-of-bounds read in hci_inquiry_result_with_rssi_evt()

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

commit 629b49c848ee71244203934347bd7730b0ddee8d upstream.

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

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 |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3948,6 +3948,9 @@ static void hci_inquiry_result_with_rssi
 		struct inquiry_info_with_rssi_and_pscan_mode *info;
 		info = (void *) (skb->data + 1);
 
+		if (skb->len < num_rsp * sizeof(*info) + 1)
+			goto unlock;
+
 		for (; num_rsp; num_rsp--, info++) {
 			u32 flags;
 
@@ -3969,6 +3972,9 @@ static void hci_inquiry_result_with_rssi
 	} else {
 		struct inquiry_info_with_rssi *info = (void *) (skb->data + 1);
 
+		if (skb->len < num_rsp * sizeof(*info) + 1)
+			goto unlock;
+
 		for (; num_rsp; num_rsp--, info++) {
 			u32 flags;
 
@@ -3989,6 +3995,7 @@ static void hci_inquiry_result_with_rssi
 		}
 	}
 
+unlock:
 	hci_dev_unlock(hdev);
 }