[PATCH] D58111: [Sema] Fix a crash in access checking for deduction guides

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov created this revision.
ilya-biryukov added a reviewer: sammccall.
Herald added a project: clang.

See the added test for a repro.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D58111

Files:
  clang/lib/Sema/SemaDeclCXX.cpp
  clang/test/Sema/crash-deduction-guide-access.cpp


Index: clang/test/Sema/crash-deduction-guide-access.cpp
===================================================================
--- /dev/null
+++ clang/test/Sema/crash-deduction-guide-access.cpp
@@ -0,0 +1,11 @@
+// RUN: not %clang_cc1 -x c++ -std=c++17 -fsyntax-only %s
+template <typename U>
+class Imp {
+  template <typename F>
+  explicit Imp(F f);
+};
+
+template <typename T>
+class Cls {
+  explicit Imp() : f() {}
+};
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -3175,7 +3175,11 @@
     //   declared] with the same access [as the template].
     if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) {
       auto *TD = DG->getDeducedTemplate();
-      if (AS != TD->getAccess()) {
+      bool InSameScope = TD->getDeclContext()->getRedeclContext()->Equals(
+          DG->getDeclContext()->getRedeclContext());
+      // Access specifiers are only meaningful if both the template and the
+      // deduction guide are from the same scope.
+      if (InSameScope && AS != TD->getAccess()) {
         Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access);
         Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access)
             << TD->getAccess();


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