# HG changeset patch
# User mdoerr
# Date 1554387106 -7200
#      Thu Apr 04 16:11:46 2019 +0200
# Node ID b6583047ea6331d4197468241eaf42b2601b26b5
# Parent  a7df0de0835abf753598d872c354a4ea1843e358
8221833: Readability check in Symbol::is_valid not performed for some addresses
Reviewed-by: zgu, coleenp

diff --git a/src/hotspot/share/runtime/os.cpp b/src/hotspot/share/runtime/os.cpp
--- a/src/hotspot/share/runtime/os.cpp
+++ b/src/hotspot/share/runtime/os.cpp
@@ -1024,8 +1024,9 @@
 }
 
 bool os::is_readable_range(const void* from, const void* to) {
-  for (address p = align_down((address)from, min_page_size()); p < to; p += min_page_size()) {
-    if (!is_readable_pointer(p)) {
+  if ((uintptr_t)from >= (uintptr_t)to) return false;
+  for (uintptr_t p = align_down((uintptr_t)from, min_page_size()); p < (uintptr_t)to; p += min_page_size()) {
+    if (!is_readable_pointer((const void*)p)) {
       return false;
     }
   }