[sanitizer] Fix crash in getgrnam_r and similar interceptors.

When no matching record is found, getgrnam_r return 0 but sets result to NULL.
Should fix PR19734.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208773 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 0 deletions

diff --git a/test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cc b/test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cc
new file mode 100644
index 000000000..a8b51d7a9
--- /dev/null
+++ b/test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cc
@@ -0,0 +1,19 @@
+// Regression test for a crash in getpwnam_r and similar interceptors.
+// RUN: %clangxx -O0 -g %s -o %t && %run %t
+
+#include <assert.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int main(void) {
+  struct passwd pwd;
+  struct passwd *pwdres;
+  char buf[10000];
+  int res = getpwnam_r("no-such-user", &pwd, buf, sizeof(buf), &pwdres);
+  assert(res == 0);
+  assert(pwdres == 0);
+  return 0;
+}