[llvm] r280473 - [Support] - Fix possible crash in match() of llvm::Regex.

George Rimar via llvm-commits llvm-commits at lists.llvm.org
Fri Sep 2 01:44:47 PDT 2016


Author: grimar
Date: Fri Sep  2 03:44:46 2016
New Revision: 280473

URL: http://llvm.org/viewvc/llvm-project?rev=280473&view=rev
Log:
[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

Modified:
    llvm/trunk/include/llvm/Support/Regex.h
    llvm/trunk/lib/Support/Regex.cpp
    llvm/trunk/unittests/Support/RegexTest.cpp

Modified: llvm/trunk/include/llvm/Support/Regex.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/Regex.h?rev=280473&r1=280472&r2=280473&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/Regex.h (original)
+++ llvm/trunk/include/llvm/Support/Regex.h Fri Sep  2 03:44:46 2016
@@ -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

Modified: llvm/trunk/lib/Support/Regex.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Regex.cpp?rev=280473&r1=280472&r2=280473&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Regex.cpp (original)
+++ llvm/trunk/lib/Support/Regex.cpp Fri Sep  2 03:44:46 2016
@@ -34,6 +34,13 @@ Regex::Regex(StringRef regex, unsigned F
   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.

Modified: llvm/trunk/unittests/Support/RegexTest.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/unittests/Support/RegexTest.cpp?rev=280473&r1=280472&r2=280473&view=diff
==============================================================================
--- llvm/trunk/unittests/Support/RegexTest.cpp (original)
+++ llvm/trunk/unittests/Support/RegexTest.cpp Fri Sep  2 03:44:46 2016
@@ -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"));
+}
+
 }




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