Fix realloc'ing freed/invalid pointers

See https://code.google.com/p/address-sanitizer/issues/detail?id=187 for the details

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182255 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/asan/tests/asan_test.cc b/lib/asan/tests/asan_test.cc
index a85c179e..112d81a6 100644
--- a/lib/asan/tests/asan_test.cc
+++ b/lib/asan/tests/asan_test.cc
@@ -353,6 +353,18 @@ TEST(AddressSanitizer, ReallocTest) {
   free(ptr2);
 }
 
+TEST(AddressSanitizer, ReallocFreedPointerTest) {
+  void *ptr = Ident(malloc(42));
+  ASSERT_TRUE(NULL != ptr);
+  free(ptr);
+  EXPECT_DEATH(ptr = realloc(ptr, 77), "attempting double-free");
+}
+
+TEST(AddressSanitizer, ReallocInvalidPointerTest) {
+  void *ptr = Ident(malloc(42));
+  EXPECT_DEATH(ptr = realloc((int*)ptr + 1, 77), "attempting free.*not malloc");
+}
+
 TEST(AddressSanitizer, ZeroSizeMallocTest) {
   // Test that malloc(0) and similar functions don't return NULL.
   void *ptr = Ident(malloc(0));