Disallow sequences with lengths exceeding max allocation supported.

third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h

Index: third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h
diff --git a/third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h b/third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h
index 1408aa16499e695bf02771ec0cb159fca97d9e4f..4699fe902cad8587045305f7e0e3643245d1acfc 100644
--- a/third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h
+++ b/third_party/WebKit/Source/wtf/allocator/PartitionAllocator.h
@@ -27,9 +27,14 @@ class WTF_EXPORT PartitionAllocator {
   typedef PartitionAllocatorDummyVisitor Visitor;
   static const bool isGarbageCollected = false;
 
+  template<typename T>
+  static size_t maxElementCountInBackingStore() {
+    return base::kGenericMaxDirectMapped / sizeof(T);
+  }
+
   template <typename T>
   static size_t quantizedSize(size_t count) {
-    RELEASE_ASSERT(count <= base::kGenericMaxDirectMapped / sizeof(T));
+    CHECK(count <= maxElementCountInBackingStore<T>());

[Yuta Kitamura, 2017/01/30 07:19:42]

nit+optional: Use CHECK_LE?

[sof, 2017/01/31 21:01:43]

Done.

     return PartitionAllocActualSize(WTF::Partitions::bufferPartition(),
                                     count * sizeof(T));
   }