Version 5.0.71.47 (cherry-pick)

src/zone.cc

Index: src/zone.cc
diff --git a/src/zone.cc b/src/zone.cc
index 9dcebba2dc1fc8fee3fd4c5fd363e6f55b3b47c0..1f722f2f608952dff173d9a377178835a70f7d08 100644
--- a/src/zone.cc
+++ b/src/zone.cc
@@ -105,7 +105,10 @@ void* Zone::New(size_t size) {
   Address result = position_;
 
   const size_t size_with_redzone = size + kASanRedzoneBytes;
-  if (limit_ < position_ + size_with_redzone) {
+  const uintptr_t limit = reinterpret_cast<uintptr_t>(limit_);
+  const uintptr_t position = reinterpret_cast<uintptr_t>(position_);
+  // position_ > limit_ can be true after the alignment correction above.
+  if (limit < position || size_with_redzone > limit - position) {
     result = NewExpand(size_with_redzone);
   } else {
     position_ += size_with_redzone;
@@ -222,7 +225,10 @@ Address Zone::NewExpand(size_t size) {
   // Make sure the requested size is already properly aligned and that
   // there isn't enough room in the Zone to satisfy the request.
   DCHECK_EQ(size, RoundDown(size, kAlignment));
-  DCHECK_LT(limit_, position_ + size);
+  DCHECK(limit_ < position_ ||
+         reinterpret_cast<uintptr_t>(limit_) -
+                 reinterpret_cast<uintptr_t>(position_) <
+             size);
 
   // Compute the new segment size. We use a 'high water mark'
   // strategy, where we increase the segment size every time we expand