m3u: fix crash when saving; fix reference leak

Author: Oleksiy-Yakovenko

plugins/m3u/m3u.c

@@ -543,6 +543,10 @@ m3uplug_save_m3u (const char *fname, DB_playItem_t *first, DB_playItem_t *last)
     }
     fclose (fp);
 
+    if (it != NULL) {
+        deadbeef->pl_item_unref (it);
+    }
+
     deadbeef->tf_free (tf);
     return 0;
 }
@@ -615,17 +619,19 @@ m3uplug_save_pls (const char *fname, DB_playItem_t *first, DB_playItem_t *last)
 
 int
 m3uplug_save (ddb_playlist_t *plt, const char *fname, DB_playItem_t *first, DB_playItem_t *last) {
+    int res = -1;
     const char *e = strrchr (fname, '.');
     if (!e) {
-        return -1;
+        return res;
     }
+
     if (!strcasecmp (e, ".m3u") || !strcasecmp (e, ".m3u8")) {
-        return m3uplug_save_m3u (fname, first, last);
+        res = m3uplug_save_m3u (fname, first, last);
     }
     else if (!strcasecmp (e, ".pls")) {
-        return m3uplug_save_pls (fname, first, last);
+        res = m3uplug_save_pls (fname, first, last);
     }
-    return -1;
+    return res;
 }
 
 static const char * exts[] = { "m3u", "m3u8", "pls", NULL };

src/playlist.c

@@ -2271,11 +2271,32 @@ plt_save(
                 if (exts && plug[i]->save) {
                     for (int e = 0; exts[e]; e++) {
                         if (!strcasecmp (exts[e], ext + 1)) {
+                            if (first == NULL) {
+                                first = plt_get_first(plt, PL_MAIN);
+                            }
+                            else {
+                                pl_item_ref(first);
+                            }
+                            if (last == NULL) {
+                                last = plt_get_last(plt, PL_MAIN);
+                            }
+                            else {
+                                pl_item_ref(last);
+                            }
+
                             int res = plug[i]->save (
                                 (ddb_playlist_t *)plt,
                                 fname,
                                 (DB_playItem_t *)first,
                                 (DB_playItem_t *)last);
+
+                            if (first != NULL) {
+                                pl_item_unref(first);
+                            }
+                            if (last != NULL) {
+                                pl_item_unref(last);
+                            }
+
                             UNLOCK;
                             return res;
                         }