Follow-up fix for PR33221, correct the vtable prefix 'is accessible' check
This came to light in
@@ -197,9 +197,9 @@ struct VtablePrefix {
};
VtablePrefix *getVtablePrefix(void *Vtable) {
VtablePrefix *Vptr = reinterpret_cast<VtablePrefix*>(Vtable);
- if (!IsAccessibleMemoryRange((uptr)Vptr, sizeof(VtablePrefix)))
- return nullptr;
VtablePrefix *Prefix = Vptr - 1;
+ if (!IsAccessibleMemoryRange((uptr)Prefix, sizeof(VtablePrefix)))
+ return nullptr;
if (!Prefix->TypeInfo)
// This can't possibly be a valid vtable.
return nullptr;
