PR21531: fix crash on invalid with unexpanded pack in case value.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222400 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 8 deletions

diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index 3c4085afe1..0d2d6032dd 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -388,14 +388,19 @@ Sema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
     }
   }
 
-  LHSVal = ActOnFinishFullExpr(LHSVal, LHSVal->getExprLoc(), false,
-                               getLangOpts().CPlusPlus11).get();
-  if (RHSVal)
-    RHSVal = ActOnFinishFullExpr(RHSVal, RHSVal->getExprLoc(), false,
-                                 getLangOpts().CPlusPlus11).get();
-
-  CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc,
-                                        ColonLoc);
+  auto LHS = ActOnFinishFullExpr(LHSVal, LHSVal->getExprLoc(), false,
+                                 getLangOpts().CPlusPlus11);
+  if (LHS.isInvalid())
+    return StmtError();
+
+  auto RHS = RHSVal ? ActOnFinishFullExpr(RHSVal, RHSVal->getExprLoc(), false,
+                                          getLangOpts().CPlusPlus11)
+                    : ExprResult();
+  if (RHS.isInvalid())
+    return StmtError();
+
+  CaseStmt *CS = new (Context)
+      CaseStmt(LHS.get(), RHS.get(), CaseLoc, DotDotDotLoc, ColonLoc);
   getCurFunction()->SwitchStack.back()->addSwitchCase(CS);
   return CS;
 }