Fix fd leak while bypassing transcoding in media APIs

To call the media service while bypassing transcoding there are 4 file
descriptors involved:

A: The original file descriptor the app owns and is responsible for
closing
B: Dupe of A, to pass into the MediaStore API as an input to receive a
non-transoding fd
C: The output from the MediaStore API
D: Final fd owned by the media service, after C gets duped over binder
as part of setDataSource

We were leaking (B) and (C). Now we close them appropriately.

See I0124ec8fbd0471237e99bab321f903544f8fe1f8 for another 2 fd leak
fix in MediaProvider

Test: atest TranscodeTest
Test: Manual with 'adb shell lsof | grep <filename>'
Bug: 194828489
Bug: 179804072
Change-Id: I978257bbc4a8f6813b6e6a5ce22124257204f432
Merged-In: I978257bbc4a8f6813b6e6a5ce22124257204f432

core/java/android/os/FileUtils.java

@@ -1460,15 +1460,15 @@ public final class FileUtils {
     /** {@hide} */
     @VisibleForTesting
     public static ParcelFileDescriptor convertToModernFd(FileDescriptor fd) {
-        try {
-            Context context = AppGlobals.getInitialApplication();
-            if (UserHandle.getAppId(Process.myUid()) == getMediaProviderAppId(context)) {
-                // Never convert modern fd for MediaProvider, because this requires
-                // MediaStore#scanFile and can cause infinite loops when MediaProvider scans
-                return null;
-            }
-            return MediaStore.getOriginalMediaFormatFileDescriptor(context,
-                    ParcelFileDescriptor.dup(fd));
+        Context context = AppGlobals.getInitialApplication();
+        if (UserHandle.getAppId(Process.myUid()) == getMediaProviderAppId(context)) {
+            // Never convert modern fd for MediaProvider, because this requires
+            // MediaStore#scanFile and can cause infinite loops when MediaProvider scans
+            return null;
+        }
+
+        try (ParcelFileDescriptor dupFd = ParcelFileDescriptor.dup(fd)) {
+            return MediaStore.getOriginalMediaFormatFileDescriptor(context, dupFd);
         } catch (Exception e) {
             Log.d(TAG, "Failed to convert to modern format file descriptor", e);
             return null;

media/java/android/media/ExifInterface.java

@@ -1573,6 +1573,9 @@ public class ExifInterface {
             if (isFdDuped) {
                 closeFileDescriptor(fileDescriptor);
             }
+            if (modernFd != null) {
+                modernFd.close();
+            }
         }
     }
 
@@ -2554,12 +2557,13 @@ public class ExifInterface {
 
     private void initForFilename(String filename) throws IOException {
         FileInputStream in = null;
+        ParcelFileDescriptor modernFd = null;
         mAssetInputStream = null;
         mFilename = filename;
         mIsInputStream = false;
         try {
             in = new FileInputStream(filename);
-            ParcelFileDescriptor modernFd = FileUtils.convertToModernFd(in.getFD());
+            modernFd = FileUtils.convertToModernFd(in.getFD());
             if (modernFd != null) {
                 closeQuietly(in);
                 in = new FileInputStream(modernFd.getFileDescriptor());
@@ -2570,6 +2574,9 @@ public class ExifInterface {
             loadAttributes(in);
         } finally {
             closeQuietly(in);
+            if (modernFd != null) {
+                modernFd.close();
+            }
         }
     }
 

media/java/android/media/MediaMetadataRetriever.java

@@ -36,6 +36,7 @@ import android.os.IBinder;
 import android.os.ParcelFileDescriptor;
 import android.os.SystemProperties;
 import android.text.TextUtils;
+import android.util.Log;
 
 import java.io.FileDescriptor;
 import java.io.FileInputStream;
@@ -52,6 +53,8 @@ import java.util.Map;
  * frame and meta data from an input media file.
  */
 public class MediaMetadataRetriever implements AutoCloseable {
+    private static final String TAG = "MediaMetadataRetriever";
+
     // borrowed from ExoPlayer
     private static final String[] STANDARD_GENRES = new String[] {
             // These are the official ID3v1 genres.
@@ -301,11 +304,15 @@ public class MediaMetadataRetriever implements AutoCloseable {
      */
     public void setDataSource(FileDescriptor fd, long offset, long length)
             throws IllegalArgumentException  {
-        ParcelFileDescriptor modernFd = FileUtils.convertToModernFd(fd);
-        if (modernFd == null) {
-            _setDataSource(fd, offset, length);
-        } else {
-            _setDataSource(modernFd.getFileDescriptor(), offset, length);
+
+        try (ParcelFileDescriptor modernFd = FileUtils.convertToModernFd(fd)) {
+            if (modernFd == null) {
+                _setDataSource(fd, offset, length);
+            } else {
+                _setDataSource(modernFd.getFileDescriptor(), offset, length);
+            }
+        } catch (IOException e) {
+            Log.w(TAG, "Ignoring IO error while setting data source", e);
         }
     }
 

media/java/android/media/MediaPlayer.java

@@ -1271,11 +1271,14 @@ public class MediaPlayer extends PlayerBase
      */
     public void setDataSource(FileDescriptor fd, long offset, long length)
             throws IOException, IllegalArgumentException, IllegalStateException {
-        ParcelFileDescriptor modernFd = FileUtils.convertToModernFd(fd);
-        if (modernFd == null) {
-            _setDataSource(fd, offset, length);
-        } else {
-            _setDataSource(modernFd.getFileDescriptor(), offset, length);
+        try (ParcelFileDescriptor modernFd = FileUtils.convertToModernFd(fd)) {
+            if (modernFd == null) {
+                _setDataSource(fd, offset, length);
+            } else {
+                _setDataSource(modernFd.getFileDescriptor(), offset, length);
+            }
+        } catch (IOException e) {
+            Log.w(TAG, "Ignoring IO error while setting data source", e);
         }
     }