[Android] libvlc: fix leaks and crash if no metadata found

[Thomas Guillem]

vlc-ports/android | branch: master | Thomas Guillem <thomas at gllm.fr> | Fri Dec 19 10:32:51 2014 +0100| [886f411a9c1d4f1da7e4875886cbdbc712d54fa6] | committer: Jean-Baptiste Kempf

libvlc: fix leaks and crash if no metadata found

you have to free char * returned by libvlc_media_get_meta.

> http://git.videolan.org/gitweb.cgi/vlc-ports/android.git/?a=commit;h=886f411a9c1d4f1da7e4875886cbdbc712d54fa6
---

 libvlc/jni/libvlcjni-track.c              |   28 ++++++++++++++++++++--------
 libvlc/jni/libvlcjni.c                    |    9 ++++++++-
 libvlc/src/org/videolan/libvlc/Media.java |   12 +++++++++---
 3 files changed, 37 insertions(+), 12 deletions(-)

diff --git a/libvlc/jni/libvlcjni-track.c b/libvlc/jni/libvlcjni-track.c
index 398242b..7b1dc05 100644
--- a/libvlc/jni/libvlcjni-track.c
+++ b/libvlc/jni/libvlcjni-track.c
@@ -132,6 +132,9 @@ jobjectArray read_track_info_internal(JNIEnv *env, jobject thiz, libvlc_media_t*
     libvlc_media_track_t **p_tracks;
 
     int i_nbTracks = libvlc_media_tracks_get(p_m, &p_tracks);
+    if (i_nbTracks == 0)
+        return NULL;
+
     jobjectArray array = (*env)->NewObjectArray(env, i_nbTracks + 1, cls, NULL);
 
     unsigned i;
@@ -147,16 +150,25 @@ jobjectArray read_track_info_internal(JNIEnv *env, jobject thiz, libvlc_media_t*
             // use last track for metadata
             if (i == i_nbTracks)
             {
+#define SET_STRING_META(title, vlc_meta) do { \
+    char *psz_meta = libvlc_media_get_meta(p_m, vlc_meta); \
+    if (psz_meta) { \
+        setString(env, item, title, psz_meta); \
+        free(psz_meta); \
+    } \
+} while (0)
+
                 setInt(env, item, "Type", 3 /* TYPE_META */);
                 setLong(env, item, "Length", libvlc_media_get_duration(p_m));
-                setString(env, item, "Title", libvlc_media_get_meta(p_m, libvlc_meta_Title));
-                setString(env, item, "Artist", libvlc_media_get_meta(p_m, libvlc_meta_Artist));
-                setString(env, item, "Album", libvlc_media_get_meta(p_m, libvlc_meta_Album));
-                setString(env, item, "Genre", libvlc_media_get_meta(p_m, libvlc_meta_Genre));
-                setString(env, item, "ArtworkURL", libvlc_media_get_meta(p_m, libvlc_meta_ArtworkURL));
-                setString(env, item, "NowPlaying", libvlc_media_get_meta(p_m, libvlc_meta_NowPlaying));
-                setString(env, item, "TrackNumber", libvlc_media_get_meta(p_m, libvlc_meta_TrackNumber));
-                setString(env, item, "AlbumArtist", libvlc_media_get_meta(p_m, libvlc_meta_AlbumArtist));
+                SET_STRING_META("Title", libvlc_meta_Title);
+                SET_STRING_META("Artist", libvlc_meta_Artist);
+                SET_STRING_META("Album", libvlc_meta_Album);
+                SET_STRING_META("Genre", libvlc_meta_Genre);
+                SET_STRING_META("ArtworkURL", libvlc_meta_ArtworkURL);
+                SET_STRING_META("NowPlaying", libvlc_meta_NowPlaying);
+                SET_STRING_META("TrackNumber", libvlc_meta_TrackNumber);
+                SET_STRING_META("AlbumArtist", libvlc_meta_AlbumArtist);
+#undef SET_STRING_META
                 continue;
             }
 
diff --git a/libvlc/jni/libvlcjni.c b/libvlc/jni/libvlcjni.c
index 94b216c..1242e3b 100644
--- a/libvlc/jni/libvlcjni.c
+++ b/libvlc/jni/libvlcjni.c
@@ -606,6 +606,8 @@ jstring Java_org_videolan_libvlc_LibVLC_changeset(JNIEnv* env, jobject thiz)
 jstring Java_org_videolan_libvlc_LibVLC_getMeta(JNIEnv *env, jobject thiz, int meta)
 {
     libvlc_media_player_t *mp = getMediaPlayer(env, thiz);
+    char *psz_meta;
+    jstring string = NULL;
     if (!mp)
         return NULL;
 
@@ -613,7 +615,12 @@ jstring Java_org_videolan_libvlc_LibVLC_getMeta(JNIEnv *env, jobject thiz, int m
     if (!p_mp)
         return NULL;
 
-    return (*env)->NewStringUTF(env, libvlc_media_get_meta(p_mp, meta));
+    psz_meta = libvlc_media_get_meta(p_mp, meta);
+    if (psz_meta) {
+        string = (*env)->NewStringUTF(env, psz_meta);
+        free(psz_meta);
+    }
+    return string;
 }
 
 jint Java_org_videolan_libvlc_LibVLC_getTitle(JNIEnv *env, jobject thiz)
diff --git a/libvlc/src/org/videolan/libvlc/Media.java b/libvlc/src/org/videolan/libvlc/Media.java
index 4e333be..8dd0b0f 100644
--- a/libvlc/src/org/videolan/libvlc/Media.java
+++ b/libvlc/src/org/videolan/libvlc/Media.java
@@ -167,8 +167,14 @@ public class Media implements Comparable<Media> {
     }
 
     private void extractTrackInfo(TrackInfo[] tracks) {
-        if (tracks == null)
+        if (tracks == null) {
+            mTitle = null;
+            mArtist = getValueWrapper(null, UnknownStringType.Artist).trim();
+            mAlbum = getValueWrapper(null, UnknownStringType.Album).trim();
+            mGenre = getValueWrapper(null, UnknownStringType.Genre).trim();
+            mAlbumArtist = getValueWrapper(null, UnknownStringType.AlbumArtist).trim();
             return;
+        }
 
         for (TrackInfo track : tracks) {
             if (track.Type == TrackInfo.TYPE_VIDEO) {
@@ -179,7 +185,7 @@ public class Media implements Comparable<Media> {
                 mType = TYPE_AUDIO;
             } else if (track.Type == TrackInfo.TYPE_META) {
                 mLength = track.Length;
-                mTitle = track.Title.trim();
+                mTitle = track.Title != null ? track.Title.trim() : null;
                 mArtist = getValueWrapper(track.Artist, UnknownStringType.Artist).trim();
                 mAlbum = getValueWrapper(track.Album, UnknownStringType.Album).trim();
                 mGenre = getValueWrapper(track.Genre, UnknownStringType.Genre).trim();
@@ -301,7 +307,7 @@ public class Media implements Comparable<Media> {
      */
     @Override
     public int compareTo(Media another) {
-        return mTitle.toUpperCase(Locale.getDefault()).compareTo(
+        return getTitle().toUpperCase(Locale.getDefault()).compareTo(
                 another.getTitle().toUpperCase(Locale.getDefault()));
     }