diff --git a/core/java/android/net/Uri.java b/core/java/android/net/Uri.java
index 815e4f0..d71faee4 100644
--- a/core/java/android/net/Uri.java
+++ b/core/java/android/net/Uri.java
@@ -1205,13 +1205,16 @@
         }
 
         static Uri readFrom(Parcel parcel) {
-            return new HierarchicalUri(
-                parcel.readString8(),
-                Part.readFrom(parcel),
-                PathPart.readFrom(parcel),
-                Part.readFrom(parcel),
-                Part.readFrom(parcel)
-            );
+            final String scheme = parcel.readString8();
+            final Part authority = Part.readFrom(parcel);
+            // In RFC3986 the path should be determined based on whether there is a scheme or
+            // authority present (https://www.rfc-editor.org/rfc/rfc3986.html#section-3.3).
+            final boolean hasSchemeOrAuthority =
+                    (scheme != null && scheme.length() > 0) || !authority.isEmpty();
+            final PathPart path = PathPart.readFrom(hasSchemeOrAuthority, parcel);
+            final Part query = Part.readFrom(parcel);
+            final Part fragment = Part.readFrom(parcel);
+            return new HierarchicalUri(scheme, authority, path, query, fragment);
         }
 
         public int describeContents() {
@@ -2270,6 +2273,11 @@
             }
         }
 
+        static PathPart readFrom(boolean hasSchemeOrAuthority, Parcel parcel) {
+            final PathPart path = readFrom(parcel);
+            return hasSchemeOrAuthority ? makeAbsolute(path) : path;
+        }
+
         /**
          * Creates a path from the encoded string.
          *
diff --git a/core/tests/coretests/src/android/net/UriTest.java b/core/tests/coretests/src/android/net/UriTest.java
index e083b0d..3733bfa 100644
--- a/core/tests/coretests/src/android/net/UriTest.java
+++ b/core/tests/coretests/src/android/net/UriTest.java
@@ -48,6 +48,7 @@
     public void testParcelling() {
         parcelAndUnparcel(Uri.parse("foo:bob%20lee"));
         parcelAndUnparcel(Uri.fromParts("foo", "bob lee", "fragment"));
+        parcelAndUnparcel(Uri.fromParts("https", "www.google.com", null));
         parcelAndUnparcel(new Uri.Builder()
             .scheme("http")
             .authority("crazybob.org")
@@ -890,9 +891,62 @@
             Throwable targetException = expected.getTargetException();
             // Check that the exception was thrown for the correct reason.
             assertEquals("Unknown representation: 0", targetException.getMessage());
+        } finally {
+            parcel.recycle();
         }
     }
 
+    private Uri buildUriFromRawParcel(boolean argumentsEncoded,
+                                      String scheme,
+                                      String authority,
+                                      String path,
+                                      String query,
+                                      String fragment) {
+        // Representation value (from AbstractPart.REPRESENTATION_{ENCODED,DECODED}).
+        final int representation = argumentsEncoded ? 1 : 2;
+        Parcel parcel = Parcel.obtain();
+        try {
+            parcel.writeInt(3);  // hierarchical
+            parcel.writeString8(scheme);
+            parcel.writeInt(representation);
+            parcel.writeString8(authority);
+            parcel.writeInt(representation);
+            parcel.writeString8(path);
+            parcel.writeInt(representation);
+            parcel.writeString8(query);
+            parcel.writeInt(representation);
+            parcel.writeString8(fragment);
+            parcel.setDataPosition(0);
+            return Uri.CREATOR.createFromParcel(parcel);
+        } finally {
+            parcel.recycle();
+        }
+    }
+
+    public void testUnparcelMalformedPath() {
+        // Regression tests for b/171966843.
+
+        // Test cases with arguments encoded (covering testing `scheme` * `authority` options).
+        Uri uri0 = buildUriFromRawParcel(true, "https", "google.com", "@evil.com", null, null);
+        assertEquals("https://google.com/@evil.com", uri0.toString());
+        Uri uri1 = buildUriFromRawParcel(true, null, "google.com", "@evil.com", "name=spark", "x");
+        assertEquals("//google.com/@evil.com?name=spark#x", uri1.toString());
+        Uri uri2 = buildUriFromRawParcel(true, "http:", null, "@evil.com", null, null);
+        assertEquals("http::/@evil.com", uri2.toString());
+        Uri uri3 = buildUriFromRawParcel(true, null, null, "@evil.com", null, null);
+        assertEquals("@evil.com", uri3.toString());
+
+        // Test cases with arguments not encoded (covering testing `scheme` * `authority` options).
+        Uri uriA = buildUriFromRawParcel(false, "https", "google.com", "@evil.com", null, null);
+        assertEquals("https://google.com/%40evil.com", uriA.toString());
+        Uri uriB = buildUriFromRawParcel(false, null, "google.com", "@evil.com", null, null);
+        assertEquals("//google.com/%40evil.com", uriB.toString());
+        Uri uriC = buildUriFromRawParcel(false, "http:", null, "@evil.com", null, null);
+        assertEquals("http::/%40evil.com", uriC.toString());
+        Uri uriD = buildUriFromRawParcel(false, null, null, "@evil.com", "name=spark", "y");
+        assertEquals("%40evil.com?name%3Dspark#y", uriD.toString());
+    }
+
     public void testToSafeString() {
         checkToSafeString("tel:xxxxxx", "tel:Google");
         checkToSafeString("tel:xxxxxxxxxx", "tel:1234567890");