fixes a security vulnerability in slice provider

Bug: 138441555
Test: Manual
Change-Id: Ib1b4fba54ebd3599fe11021d21dc9b09d34e8965
Merged-In: Ib1b4fba54ebd3599fe11021d21dc9b09d34e8965
(cherry picked from commit 2b415a4c4465a6294e51ad1a8fcf2e6c1497853b)
(cherry picked from commit a6364d92edafd79006da671c5d476de77439e45c)

1 files changed, 14 insertions, 6 deletions

diff --git a/core/java/android/app/slice/SliceProvider.java b/core/java/android/app/slice/SliceProvider.java
index 0ccd49f2e02..5e530eedd81 100644
--- a/core/java/android/app/slice/SliceProvider.java
+++ b/core/java/android/app/slice/SliceProvider.java
@@ -355,7 +355,8 @@ public abstract class SliceProvider extends ContentProvider {
     @Override
     public Bundle call(String method, String arg, Bundle extras) {
         if (method.equals(METHOD_SLICE)) {
-            Uri uri = getUriWithoutUserId(extras.getParcelable(EXTRA_BIND_URI));
+            Uri uri = getUriWithoutUserId(validateIncomingUriOrNull(
+                    extras.getParcelable(EXTRA_BIND_URI)));
             List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS);
 
             String callingPackage = getCallingPackage();
@@ -369,7 +370,7 @@ public abstract class SliceProvider extends ContentProvider {
         } else if (method.equals(METHOD_MAP_INTENT)) {
             Intent intent = extras.getParcelable(EXTRA_INTENT);
             if (intent == null) return null;
-            Uri uri = onMapIntentToUri(intent);
+            Uri uri = validateIncomingUriOrNull(onMapIntentToUri(intent));
             List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS);
             Bundle b = new Bundle();
             if (uri != null) {
@@ -383,24 +384,27 @@ public abstract class SliceProvider extends ContentProvider {
         } else if (method.equals(METHOD_MAP_ONLY_INTENT)) {
             Intent intent = extras.getParcelable(EXTRA_INTENT);
             if (intent == null) return null;
-            Uri uri = onMapIntentToUri(intent);
+            Uri uri = validateIncomingUriOrNull(onMapIntentToUri(intent));
             Bundle b = new Bundle();
             b.putParcelable(EXTRA_SLICE, uri);
             return b;
         } else if (method.equals(METHOD_PIN)) {
-            Uri uri = getUriWithoutUserId(extras.getParcelable(EXTRA_BIND_URI));
+            Uri uri = getUriWithoutUserId(validateIncomingUriOrNull(
+                    extras.getParcelable(EXTRA_BIND_URI)));
             if (Binder.getCallingUid() != Process.SYSTEM_UID) {
                 throw new SecurityException("Only the system can pin/unpin slices");
             }
             handlePinSlice(uri);
         } else if (method.equals(METHOD_UNPIN)) {
-            Uri uri = getUriWithoutUserId(extras.getParcelable(EXTRA_BIND_URI));
+            Uri uri = getUriWithoutUserId(validateIncomingUriOrNull(
+                    extras.getParcelable(EXTRA_BIND_URI)));
             if (Binder.getCallingUid() != Process.SYSTEM_UID) {
                 throw new SecurityException("Only the system can pin/unpin slices");
             }
             handleUnpinSlice(uri);
         } else if (method.equals(METHOD_GET_DESCENDANTS)) {
-            Uri uri = getUriWithoutUserId(extras.getParcelable(EXTRA_BIND_URI));
+            Uri uri = getUriWithoutUserId(
+                    validateIncomingUriOrNull(extras.getParcelable(EXTRA_BIND_URI)));
             Bundle b = new Bundle();
             b.putParcelableArrayList(EXTRA_SLICE_DESCENDANTS,
                     new ArrayList<>(handleGetDescendants(uri)));
@@ -416,6 +420,10 @@ public abstract class SliceProvider extends ContentProvider {
         return super.call(method, arg, extras);
     }
 
+    private Uri validateIncomingUriOrNull(Uri uri) {
+        return uri == null ? null : validateIncomingUri(uri);
+    }
+
     private Collection<Uri> handleGetDescendants(Uri uri) {
         mCallback = "onGetSliceDescendants";
         return onGetSliceDescendants(uri);