From 4d91b5aa0b564551af2be26fb7ace1c83dff3884 Mon Sep 17 00:00:00 2001
From: Wu Ahan <ahanwu@google.com>
Date: Thu, 2 Dec 2021 08:23:26 +0000
Subject: [PATCH] DO NOT MERGE: Decode the input of both setStream and
 setResource calls first

The size of the input of both setStream and setResource may very big
that system server got oom while handling it, so we try to decode it
first before copying it to the wallpaper path, if the decoding fails, we
treat the input as an invalid input.

Bug: 204087139
Test: Manually set wallpaper, no PDoS observed.
Change-Id: I014cf461954992782b3dfa0dde67c98a572cc770
---
 core/java/android/app/WallpaperManager.java | 40 +++++++++++++++------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index 325a54bffbfbc..a67475b301ee3 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -1180,18 +1180,27 @@ public class WallpaperManager {
                     mContext.getUserId());
             if (fd != null) {
                 FileOutputStream fos = null;
-                boolean ok = false;
+                final Bitmap tmp = BitmapFactory.decodeStream(resources.openRawResource(resid));
                 try {
-                    fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd);
-                    copyStreamToWallpaperFile(resources.openRawResource(resid), fos);
-                    // The 'close()' is the trigger for any server-side image manipulation,
-                    // so we must do that before waiting for completion.
-                    fos.close();
-                    completion.waitForCompletion();
+                    // If the stream can't be decoded, treat it as an invalid input.
+                    if (tmp != null) {
+                        fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd);
+                        tmp.compress(Bitmap.CompressFormat.PNG, 100, fos);
+                        // The 'close()' is the trigger for any server-side image manipulation,
+                        // so we must do that before waiting for completion.
+                        fos.close();
+                        completion.waitForCompletion();
+                    } else {
+                        throw new IllegalArgumentException(
+                                "Resource 0x" + Integer.toHexString(resid) + " is invalid");
+                    }
                 } finally {
                     // Might be redundant but completion shouldn't wait unless the write
                     // succeeded; this is a fallback if it threw past the close+wait.
                     IoUtils.closeQuietly(fos);
+                    if (tmp != null) {
+                        tmp.recycle();
+                    }
                 }
             }
         } catch (RemoteException e) {
@@ -1433,13 +1442,22 @@ public class WallpaperManager {
                     result, which, completion, mContext.getUserId());
             if (fd != null) {
                 FileOutputStream fos = null;
+                final Bitmap tmp = BitmapFactory.decodeStream(bitmapData);
                 try {
-                    fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd);
-                    copyStreamToWallpaperFile(bitmapData, fos);
-                    fos.close();
-                    completion.waitForCompletion();
+                    // If the stream can't be decoded, treat it as an invalid input.
+                    if (tmp != null) {
+                        fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd);
+                        tmp.compress(Bitmap.CompressFormat.PNG, 100, fos);
+                        fos.close();
+                        completion.waitForCompletion();
+                    } else {
+                        throw new IllegalArgumentException("InputStream is invalid");
+                    }
                 } finally {
                     IoUtils.closeQuietly(fos);
+                    if (tmp != null) {
+                        tmp.recycle();
+                    }
                 }
             }
         } catch (RemoteException e) {