2 files changed, 8 insertions, 1 deletions
diff --git a/src/corelib/kernel/qvariant.h b/src/corelib/kernel/qvariant.h
index 1fd304e772..d93df46275 100644
--- a/src/corelib/kernel/qvariant.h
+++ b/src/corelib/kernel/qvariant.h
@@ -78,6 +78,7 @@ public:
     private:
         inline PrivateShared() : ref(1) { }
     public:
+        static size_t computeAllocationSize(size_t size, size_t align);
         static PrivateShared *create(size_t size, size_t align);
         static void free(PrivateShared *p);
 
diff --git a/src/corelib/kernel/qvariant_p.h b/src/corelib/kernel/qvariant_p.h
index f5f4d0fb8a..8787f140f8 100644
--- a/src/corelib/kernel/qvariant_p.h
+++ b/src/corelib/kernel/qvariant_p.h
@@ -34,7 +34,7 @@ customConstructShared(size_t size, size_t align, F &&construct)
     return ptr.release();
 }
 
-inline QVariant::PrivateShared *QVariant::PrivateShared::create(size_t size, size_t align)
+inline size_t QVariant::PrivateShared::computeAllocationSize(size_t size, size_t align)
 {
     size += sizeof(PrivateShared);
     if (align > sizeof(PrivateShared)) {
@@ -44,6 +44,12 @@ inline QVariant::PrivateShared *QVariant::PrivateShared::create(size_t size, siz
         // alignment.
         size += align - sizeof(PrivateShared);
     }
+    return size;
+}
+
+inline QVariant::PrivateShared *QVariant::PrivateShared::create(size_t size, size_t align)
+{
+    size = computeAllocationSize(size, align);
     void *data = operator new(size);
     auto *ps = new (data) QVariant::PrivateShared();
     ps->offset = int(((quintptr(ps) + sizeof(PrivateShared) + align - 1) & ~(align - 1)) - quintptr(ps));