Prevent accidental unlocking of USB data transfer.

When DISALLOW_USB_FILE_TRANSFER is in effect, there must be no chance to
unlock data transfer over USB.

Bug: 22291579
Change-Id: I990fedbfeecd90e7dd26981034d0352b83dc694e

1 files changed, 7 insertions, 0 deletions

diff --git a/services/usb/java/com/android/server/usb/UsbService.java b/services/usb/java/com/android/server/usb/UsbService.java
index 7a3426c..987a79f 100644
--- a/services/usb/java/com/android/server/usb/UsbService.java
+++ b/services/usb/java/com/android/server/usb/UsbService.java
@@ -273,6 +273,13 @@ public class UsbService extends IUsbManager.Stub {
     @Override
     public void setUsbDataUnlocked(boolean unlocked) {
         mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
+        // If attempt to change USB function while file transfer is restricted, ensure that
+        // usb data is always locked, and return.
+        UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
+        if (userManager.hasUserRestriction(UserManager.DISALLOW_USB_FILE_TRANSFER)) {
+            if (mDeviceManager != null) mDeviceManager.setUsbDataUnlocked(false);
+            return;
+        }
         mDeviceManager.setUsbDataUnlocked(unlocked);
     }