From 075cb5663f306798a1338da74051f6077088fc8d Mon Sep 17 00:00:00 2001
From: Simon Josefsson <simon@yubico.com>
Date: Thu, 9 Sep 2010 20:28:20 +0000
Subject: [PATCH] Handle ^D at su prompt.

---
 pam_yubico.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pam_yubico.c b/pam_yubico.c
index 044bc2c..09bff6c 100644
--- a/pam_yubico.c
+++ b/pam_yubico.c
@@ -533,6 +533,12 @@ pam_sm_authenticate (pam_handle_t * pamh,
 	  goto done;
 	}
 
+      if (resp->resp == NULL)
+	{
+	  DBG (("conv returned NULL passwd?"));
+	  goto done;
+	}
+
       DBG (("conv returned: %s", resp->resp));
 
       password = resp->resp;