Fix null dereference in CFGBlock::FilterEdge that was reported in PR 9412.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127176 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 5 deletions

diff --git a/lib/Analysis/CFG.cpp b/lib/Analysis/CFG.cpp
index 833d583907..fa98f94057 100644
--- a/lib/Analysis/CFG.cpp
+++ b/lib/Analysis/CFG.cpp
@@ -2927,15 +2927,15 @@ unsigned CFG::getNumBlkExprs() {
 bool CFGBlock::FilterEdge(const CFGBlock::FilterOptions &F,
         const CFGBlock *From, const CFGBlock *To) {
 
-  if (F.IgnoreDefaultsWithCoveredEnums) {
+  if (To && F.IgnoreDefaultsWithCoveredEnums) {
     // If the 'To' has no label or is labeled but the label isn't a
     // CaseStmt then filter this edge.
     if (const SwitchStmt *S =
-  dyn_cast_or_null<SwitchStmt>(From->getTerminator().getStmt())) {
+        dyn_cast_or_null<SwitchStmt>(From->getTerminator().getStmt())) {
       if (S->isAllEnumCasesCovered()) {
-  const Stmt *L = To->getLabel();
-  if (!L || !isa<CaseStmt>(L))
-    return true;
+        const Stmt *L = To->getLabel();
+        if (!L || !isa<CaseStmt>(L))
+          return true;
       }
     }
   }