[sanitizer] Fix PR17138.

strerror_r on OSX returns a positive error code when the errno value is
unknown. Buffer contents are initialized in any case.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@190295 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/asan/lit_tests/TestCases/strerror_r_test.cc b/lib/asan/lit_tests/TestCases/strerror_r_test.cc
new file mode 100644
index 00000000..0df009b8
--- /dev/null
+++ b/lib/asan/lit_tests/TestCases/strerror_r_test.cc
@@ -0,0 +1,13 @@
+// RUN: %clangxx_asan -O0 %s -o %t && %t
+
+// Regression test for PR17138.
+
+#include <assert.h>
+#include <string.h>
+
+int main() {
+  char buf[1024];
+  char *res = (char *)strerror_r(300, buf, sizeof(buf));
+  assert(res != 0);
+  return 0;
+}