music_mpg.c (getsome): return error if cvt-> buf is NULL

it means that we did not receive MPG123_NEW_FORMAT from libmpg123. fixes segfaults with broken files.
libsdl-org · Dec 14, 2019 · e78e3fb · e78e3fb
1 parent b347209
commit e78e3fb
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/music_mpg.c b/music_mpg.c
@@ -314,6 +314,12 @@ getsome(mpg_data* m)
         return 0;
     }
 
+    if (!cvt->buf) {
+        /* not received MPG123_NEW_FORMAT... */
+        Mix_SetError("music_mpg: No format.");
+        return 0;
+    }
+
     SDL_memcpy(cvt->buf, data, cbdata);
 
     if (cvt->needed) {