[committed] libstdc++: Fix size passed to operator delete [PR108097]

[committed] libstdc++: Fix size passed to operator delete [PR108097]

[Jonathan Wakely]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

The number of elements gets stored in _M_capacity so use a separate
variable for the number of bytes to allocate.

libstdc++-v3/ChangeLog:

	PR libstdc++/108097
	* include/std/stacktrace (basic_stracktrace::_Impl): Do not
	multiply N by sizeof(value_type) when allocating.
---
 libstdc++-v3/include/std/stacktrace | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/std/stacktrace b/libstdc++-v3/include/std/stacktrace
index 83c6463b0d8..402be3e828e 100644
--- a/libstdc++-v3/include/std/stacktrace
+++ b/libstdc++-v3/include/std/stacktrace
@@ -608,8 +608,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    {
 	      if constexpr (is_same_v<allocator_type, allocator<value_type>>)
 		{
-		  __n *= sizeof(value_type);
-		  void* const __p = _GLIBCXX_OPERATOR_NEW (__n, nothrow_t{});
+		  // For std::allocator we use nothrow-new directly so we
+		  // don't need to handle bad_alloc exceptions.
+		  size_t __nb = __n * sizeof(value_type);
+		  void* const __p = _GLIBCXX_OPERATOR_NEW (__nb, nothrow_t{});
 		  if (__p == nullptr) [[unlikely]]
 		    return nullptr;
 		  _M_frames = static_cast<pointer>(__p);
-- 
2.38.1