[GR-19783] Allocate correct amount of memory for native arrays.

PullRequest: truffleruby/1164

Author: eregon

CHANGELOG.md

@@ -30,6 +30,7 @@ Bug fixes:
 * Fixed the class of `self` and the wrapping `Module` for `Kernel#load(path, wrap=true)` (#1739).
 * Fixed missing polyglot type declaration for `RSTRING_PTR` to help with native/managed interop.
 * Fixed `Module#to_s` and `Module#inspect` to not return an extra `#<Class:` for singleton classes.
+* Arrays backed by native storage now allocate the correct amount of memory (#1828).
 
 Compatibility:
 

src/main/java/org/truffleruby/core/array/NativeArrayNodes.java

@@ -88,7 +88,7 @@ public static abstract class NativeArrayNewStoreNode extends ArrayOperationNodes
 
         @Specialization
         protected NativeArrayStorage newStore(int size) {
-            Pointer pointer = Pointer.malloc(size);
+            Pointer pointer = Pointer.malloc(size * Pointer.SIZE);
             pointer.enableAutorelease(getContext().getFinalizationService());
             return new NativeArrayStorage(pointer, size);
         }