libmp4: fix segfault

Le 28/10/2014 23:11, Frédéric Yhuel a écrit :
>  static int MP4_NextBox( stream_t *p_stream, MP4_Box_t *p_box )
>  {
> -    MP4_Box_t box;
> +    MP4_Box_t box = {0};
>
>      if( !p_box )
>      {
>

Better fail early. (untested, no sample)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/demux/mp4/libmp4.c

@@ -150,7 +150,8 @@ static int MP4_NextBox( stream_t *p_stream, MP4_Box_t *p_box )
 
     if( !p_box )
     {
-        MP4_ReadBoxCommon( p_stream, &box );
+        if ( !MP4_ReadBoxCommon( p_stream, &box ) )
+            return 0;
         p_box = &box;
     }