From d8dfeec019e053ffc3c8205378c24a7023856a0d Mon Sep 17 00:00:00 2001
From: George Rimar <grimar@accesssoftek.com>
Date: Fri, 2 Sep 2016 08:44:46 +0000
Subject: [PATCH] [Support] - Fix possible crash in match() of llvm::Regex.

Crash was possible if match() method
was called on object that was moved or object
created with empty constructor.

Testcases updated.

DIfferential revision: https://reviews.llvm.org/D24123

llvm-svn: 280473
---
 llvm/include/llvm/Support/Regex.h    |  6 +-----
 llvm/lib/Support/Regex.cpp           | 10 ++++++++++
 llvm/unittests/Support/RegexTest.cpp |  9 +++++++++
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/llvm/include/llvm/Support/Regex.h b/llvm/include/llvm/Support/Regex.h
index afabaaf..83db803 100644
--- a/llvm/include/llvm/Support/Regex.h
+++ b/llvm/include/llvm/Support/Regex.h
@@ -52,11 +52,7 @@ namespace llvm {
       std::swap(error, regex.error);
       return *this;
     }
-    Regex(Regex &&regex) {
-      preg = regex.preg;
-      error = regex.error;
-      regex.preg = nullptr;
-    }
+    Regex(Regex &&regex);
     ~Regex();
 
     /// isValid - returns the error encountered during regex compilation, or
diff --git a/llvm/lib/Support/Regex.cpp b/llvm/lib/Support/Regex.cpp
index 35641f3..68ba79e 100644
--- a/llvm/lib/Support/Regex.cpp
+++ b/llvm/lib/Support/Regex.cpp
@@ -34,6 +34,13 @@ Regex::Regex(StringRef regex, unsigned Flags) {
   error = llvm_regcomp(preg, regex.data(), flags|REG_PEND);
 }
 
+Regex::Regex(Regex &&regex) {
+  preg = regex.preg;
+  error = regex.error;
+  regex.preg = nullptr;
+  regex.error = REG_BADPAT;
+}
+
 Regex::~Regex() {
   if (preg) {
     llvm_regfree(preg);
@@ -59,6 +66,9 @@ unsigned Regex::getNumMatches() const {
 }
 
 bool Regex::match(StringRef String, SmallVectorImpl<StringRef> *Matches){
+  if (error)
+    return false;
+
   unsigned nmatch = Matches ? preg->re_nsub+1 : 0;
 
   // pmatch needs to have at least one element.
diff --git a/llvm/unittests/Support/RegexTest.cpp b/llvm/unittests/Support/RegexTest.cpp
index 7b61a03..5e3ce39 100644
--- a/llvm/unittests/Support/RegexTest.cpp
+++ b/llvm/unittests/Support/RegexTest.cpp
@@ -151,6 +151,8 @@ TEST_F(RegexTest, MoveAssign) {
   Regex r2("abc");
   r2 = std::move(r1);
   EXPECT_TRUE(r2.match("916"));
+  std::string Error;
+  EXPECT_FALSE(r1.isValid(Error));
 }
 
 TEST_F(RegexTest, NoArgConstructor) {
@@ -162,4 +164,11 @@ TEST_F(RegexTest, NoArgConstructor) {
   EXPECT_TRUE(r1.isValid(Error));
 }
 
+TEST_F(RegexTest, MatchInvalid) {
+  Regex r1;
+  std::string Error;
+  EXPECT_FALSE(r1.isValid(Error));
+  EXPECT_FALSE(r1.match("X"));
+}
+
 }
-- 
2.7.4