[PATCH 3/5] net: leasehelper: Don't crash if DNSMASQ doesn't provide lease expiry

[Peter Krempa <pkrempa@xxxxxxxxxx>]

The value is provided via environment and causes a crash if not defined.
---
 src/network/leaseshelper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/network/leaseshelper.c b/src/network/leaseshelper.c
index bf1842b..99c47a9 100644
--- 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 */
-- 
1.9.3

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