net: leaseshelper: Don't crash if DNSMASQ doesn't provide lease expiry

The value is provided via environment and causes a crash if not defined.

diff --git a/src/network/leaseshelper.c b/src/network/leaseshelper.c
index bf1842b87fb6ac61a9efa4c557100f0f157799bb..99c47a9b7b3624e0253a2bd4a223b2e982711a4a 100644 (file)
--- a/src/network/leaseshelper.c
+++ b/src/network/leaseshelper.c
@@ -181,7 +181,8 @@ main(int argc, char **argv)
         goto cleanup;
 
     /* Removed extraneous trailing space in DNSMASQ_LEASE_EXPIRES (dnsmasq < 2.52) */
-    if (exptime[strlen(exptime) - 1] == ' ')
+    if (exptime &&
+        exptime[strlen(exptime) - 1] == ' ')
         exptime[strlen(exptime) - 1] = '\0';
 
     /* Check if it is an IPv6 lease */