Explicitly close FD binder parameters in backup/restore API calls

CloseGuard is grateful.

Bug 30893100

Change-Id: Ia6bd4d88204839add59d9d245aad673d67b11bea

core/java/android/app/backup/BackupAgent.java

@@ -35,6 +35,8 @@ import android.system.StructStat;
 import android.util.ArraySet;
 import android.util.Log;
 
+import libcore.io.IoUtils;
+
 import org.xmlpull.v1.XmlPullParserException;
 
 import java.io.File;
@@ -921,6 +923,13 @@ public abstract class BackupAgent extends ContextWrapper {
                 } catch (RemoteException e) {
                     // we'll time out anyway, so we're safe
                 }
+
+                // Don't close the fd out from under the system service if this was local
+                if (Binder.getCallingPid() != Process.myPid()) {
+                    IoUtils.closeQuietly(oldState);
+                    IoUtils.closeQuietly(data);
+                    IoUtils.closeQuietly(newState);
+                }
             }
         }
 
@@ -951,6 +960,11 @@ public abstract class BackupAgent extends ContextWrapper {
                 } catch (RemoteException e) {
                     // we'll time out anyway, so we're safe
                 }
+
+                if (Binder.getCallingPid() != Process.myPid()) {
+                    IoUtils.closeQuietly(data);
+                    IoUtils.closeQuietly(newState);
+                }
             }
         }
 
@@ -994,6 +1008,10 @@ public abstract class BackupAgent extends ContextWrapper {
                 } catch (RemoteException e) {
                     // we'll time out anyway, so we're safe
                 }
+
+                if (Binder.getCallingPid() != Process.myPid()) {
+                    IoUtils.closeQuietly(data);
+                }
             }
         }
 
@@ -1041,6 +1059,10 @@ public abstract class BackupAgent extends ContextWrapper {
                 } catch (RemoteException e) {
                     // we'll time out anyway, so we're safe
                 }
+
+                if (Binder.getCallingPid() != Process.myPid()) {
+                    IoUtils.closeQuietly(data);
+                }
             }
         }