[analyzer] Fix a crash in SyntaxCString checker when given a custom strncat.

Fixes PR13476 llvm-svn: 179228
2013-04-10 22:06:29 +00:00
parent 95081bff72
commit 60d98befe8
2 changed files with 7 additions and 0 deletions
--- a/clang/lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp
@@ -101,6 +101,8 @@ public:
 //   - strncat(dst, src, sizeof(dst) - 1);
 //   - strncat(dst, src, sizeof(dst));
 bool WalkAST::containsBadStrncatPattern(const CallExpr *CE) {
+  if (CE->getNumArgs() != 3)
+    return false;
  const Expr *DstArg = CE->getArg(0);
  const Expr *SrcArg = CE->getArg(1);
  const Expr *LenArg = CE->getArg(2);