From 0cf201d4e94528a997efc74e8937d3950d8c9ed9 Mon Sep 17 00:00:00 2001
From: Cheney Ni <cheneyni@google.com>
Date: Fri, 23 Aug 2019 23:05:19 +0800
Subject: [PATCH] AdapterService: Check the PIN code length before using

The length is assigned by the framework. We should be better to check
again before using, and dropped any unexcepted input.

Bug: 139287605
Test: PoC, atest -t BluetoothInstrumentationTests:com.android.bluetooth.btservice
Change-Id: Ie2dd01e0b192e7ed1fe4b464618ddfa415dbf15c
(cherry picked from commit d6c84aa34962333448e0ed8e4ddbc9de8b73c5ac)
---
 .../android/bluetooth/btservice/AdapterService.java  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/com/android/bluetooth/btservice/AdapterService.java b/src/com/android/bluetooth/btservice/AdapterService.java
index a6d0b1cb2..0e4845f71 100644
--- a/src/com/android/bluetooth/btservice/AdapterService.java
+++ b/src/com/android/bluetooth/btservice/AdapterService.java
@@ -1457,6 +1457,12 @@ boolean setPin(BluetoothDevice device, boolean accept, int len, byte[] pinCode)
             return false;
         }
 
+        if (pinCode.length != len) {
+            android.util.EventLog.writeEvent(0x534e4554, "139287605", -1,
+                    "PIN code length mismatch");
+            return false;
+        }
+
         byte[] addr = Utils.getBytesFromAddress(device.getAddress());
         return pinReplyNative(addr, accept, len, pinCode);
     }
@@ -1468,6 +1474,12 @@ boolean setPasskey(BluetoothDevice device, boolean accept, int len, byte[] passk
             return false;
         }
 
+        if (passkey.length != len) {
+            android.util.EventLog.writeEvent(0x534e4554, "139287605", -1,
+                    "Passkey length mismatch");
+            return false;
+        }
+
         byte[] addr = Utils.getBytesFromAddress(device.getAddress());
         return sspReplyNative(addr, AbstractionLayer.BT_SSP_VARIANT_PASSKEY_ENTRY, accept,
                 Utils.byteArrayToInt(passkey));