Move the null check before assigning parentId to root doc ID.

Test: Manual test.
Bug: 63901648
Exempt-From-Owner-Approval: Bug 63673347
Change-Id: I28c0abbb13900567b8e6693d11b3c82055205520

1 files changed, 5 insertions, 3 deletions

diff --git a/src/com/android/providers/downloads/DownloadStorageProvider.java b/src/com/android/providers/downloads/DownloadStorageProvider.java
index bbcb06d2..5d817a3d 100644
--- a/src/com/android/providers/downloads/DownloadStorageProvider.java
+++ b/src/com/android/providers/downloads/DownloadStorageProvider.java
@@ -131,7 +131,11 @@ public class DownloadStorageProvider extends FileSystemProvider {
     }
 
     @Override
-    public Path findDocumentPath(String parentDocId, String docId) throws FileNotFoundException {
+    public Path findDocumentPath(@Nullable String parentDocId, String docId) throws FileNotFoundException {
+
+        // parentDocId is null if the client is asking for the path to the root of a doc tree.
+        // Don't share root information with those who shouldn't know it.
+        final String rootId = (parentDocId == null) ? DOC_ID_ROOT : null;
 
         if (parentDocId == null) {
             parentDocId = DOC_ID_ROOT;
@@ -141,8 +145,6 @@ public class DownloadStorageProvider extends FileSystemProvider {
 
         final File doc = getFileForDocId(docId);
 
-        final String rootId = (parentDocId == null) ? DOC_ID_ROOT : null;
-
         return new Path(rootId, findDocumentPath(parent, doc));
     }