YQL-14400 Try to fix UB.

ref:3237ad5d70fe4896f4cb110495cf2789bb58ab13

1 files changed, 2 insertions, 2 deletions

diff --git a/ydb/library/yql/minikql/computation/mkql_computation_node_holders.cpp b/ydb/library/yql/minikql/computation/mkql_computation_node_holders.cpp
index 67a7cfb3028..b1fa85e4f63 100644
--- a/ydb/library/yql/minikql/computation/mkql_computation_node_holders.cpp
+++ b/ydb/library/yql/minikql/computation/mkql_computation_node_holders.cpp
@@ -254,8 +254,8 @@ public:
     void* operator new(size_t sz) = delete;
     void* operator new[](size_t sz) = delete;
     void operator delete(void *mem, std::size_t sz) {
-        auto extraSize = ((TDirectArrayHolderInplace*)mem)->GetSize() * sizeof(NUdf::TUnboxedValue);
-        MKQLFreeWithSize(mem, sz + extraSize);
+        const auto pSize = static_cast<void*>(static_cast<ui8*>(mem) + offsetof(TDirectArrayHolderInplace, Size));
+        MKQLFreeWithSize(mem, sz + *static_cast<ui32*>(pSize) * sizeof(NUdf::TUnboxedValue));
     }
 
     void operator delete[](void *mem, std::size_t sz) = delete;