[libc++] Use correct size for deallocation of arrays in shared_ptr (#68233)

Fixes #68051.

Current implementation passes the number of `_AlignedStorage` objects
when it calls to `allocate` and the number of **bytes** on `deallocate`.
This only applies to allocations that allocate control block and the
storage together, i.e. `make_shared` and `allocate_shared`.

Found by ASan under Clang combined with `-fsized-deallocation`.

Author: ilya-biryukov

libcxx/include/__memory/shared_ptr.h

@@ -1137,7 +1137,8 @@ struct __unbounded_array_control_block<_Tp[], _Alloc> : __shared_weak_count
         __alloc_.~_Alloc();
         size_t __size = __unbounded_array_control_block::__bytes_for(__count_);
         _AlignedStorage* __storage = reinterpret_cast<_AlignedStorage*>(this);
-        allocator_traits<_StorageAlloc>::deallocate(__tmp, _PointerTraits::pointer_to(*__storage), __size);
+        allocator_traits<_StorageAlloc>::deallocate(
+            __tmp, _PointerTraits::pointer_to(*__storage), __size / sizeof(_AlignedStorage));
     }
 
     _LIBCPP_NO_UNIQUE_ADDRESS _Alloc __alloc_;
@@ -1220,7 +1221,7 @@ struct __bounded_array_control_block<_Tp[_Count], _Alloc>
 
         _ControlBlockAlloc __tmp(__alloc_);
         __alloc_.~_Alloc();
-        allocator_traits<_ControlBlockAlloc>::deallocate(__tmp, _PointerTraits::pointer_to(*this), sizeof(*this));
+        allocator_traits<_ControlBlockAlloc>::deallocate(__tmp, _PointerTraits::pointer_to(*this), 1);
     }
 
     _LIBCPP_NO_UNIQUE_ADDRESS _Alloc __alloc_;

libcxx/test/libcxx/memory/shared_ptr_array.pass.cpp

@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// REQUIRES: -fsized-deallocation
+// ADDITIONAL_COMPILE_FLAGS: -fsized-deallocation
+
+// This test will fail with ASan if the implementation passes different sizes
+// to corresponding allocation and deallocation functions.
+
+#include <memory>
+
+int main(int, char**) {
+  std::allocate_shared<int[]>(std::allocator<int>{}, 10);
+  std::make_shared<int[]>(10);
+
+  std::allocate_shared<int[10]>(std::allocator<int>{});
+  std::make_shared<int[10]>();
+
+  return 0;
+}