From fececcbc3890955fd46f92036e9cb6ee7d0a60f4 Mon Sep 17 00:00:00 2001
From: Anna Zaks <ganna@apple.com>
Date: Wed, 10 Apr 2013 22:06:29 +0000
Subject: [analyzer] Fix a crash in SyntaxCString checker when given a custom
 strncat.

Fixes PR13476

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179228 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp')

diff --git a/lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp b/lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp
index 3a57a56aea..92c0eef3e8 100644
--- a/lib/StaticAnalyzer/Checkers/CStringSyntaxChecker.cpp
+++ b/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);
-- 
cgit v1.2.3-18-g5258