@@ -528,6 +528,8 @@ static int read_extra_header(FFV1Context *f)

     if (f->version > 2) {

         c->bytestream_end -= 4;

         f->micro_version = get_symbol(c, state, 0);

+        if (f->micro_version < 0)

+            return AVERROR_INVALIDDATA;

     }

     f->ac = f->avctx->coder_type = get_symbol(c, state, 0);

     if (f->ac > 1) {