[clang][bytecode] Don't crash on a null Descriptor (#160506)

... for dynamic memory allocation. This happens when the requested array
size is too large.

Fixes #152951

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/test/AST/ByteCode/new-delete.cpp b/clang/test/AST/ByteCode/new-delete.cpp
index af747d7a15b1..f54854070573 100644
--- a/clang/test/AST/ByteCode/new-delete.cpp
+++ b/clang/test/AST/ByteCode/new-delete.cpp
@@ -1091,6 +1091,19 @@ namespace NewNegSizeNothrow {
   static_assert(test_nothrow_neg_size(), "expected nullptr");
 } // namespace NewNegSizeNothrow
 
+#if __SIZEOF_SIZE_T == 8
+/// We can't allocate the array here as it is too big.
+/// Make sure we're not crashing by assuming an non-null
+/// Descriptor.
+namespace HugeAllocation {
+  void *p;
+  void foo ()
+  {
+    p = new char [256][256][256][256][256];
+  }
+}
+#endif
+
 #else
 /// Make sure we reject this prior to C++20
 constexpr int a() { // both-error {{never produces a constant expression}}