From 944493e47275e8839331a0078a76c704b33a9fd6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
Date: Tue, 8 Dec 2020 21:04:45 +0100
Subject: [PATCH] pam_fprintd: Protect usage of strdup for NULL values

It's not smart as g_strdup, so need to ensure we don't use it for NULL
strings.

This is a regression caused by commit bf223662
---
 pam/pam_fprintd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pam/pam_fprintd.c b/pam/pam_fprintd.c
index 902c59b..02caf07 100644
--- a/pam/pam_fprintd.c
+++ b/pam/pam_fprintd.c
@@ -155,7 +155,7 @@ open_device (pam_handle_t *pamh,
 
   sd_bus_message_exit_container (m);
 
-  return strdup (path);
+  return path ? strdup (path) : NULL;
 }
 
 typedef struct
@@ -226,7 +226,7 @@ verify_result (sd_bus_message *m,
       data->result = NULL;
     }
 
-  if (done)
+  if (done && result)
     {
       data->result = strdup (result);
       return 0;