================
@@ -33,6 +33,7 @@ Pointer::Pointer(Block *Pointee, uint64_t BaseAndOffset)
 Pointer::Pointer(Block *Pointee, unsigned Base, uint64_t Offset)
     : Offset(Offset), StorageKind(Storage::Block) {
   assert((Base == RootPtrMark || Base % alignof(void *) == 0) && "wrong base");
+  assert(Base >= Pointee->getDescriptor()->getMetadataSize());
----------------
shafik wrote:

You dereference `Pointee` unconditionally here but below we have a `nullptr` 
check on `Pointee`. One of these is an error.

https://github.com/llvm/llvm-project/pull/168053
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