1 files changed, 2 insertions, 1 deletions
diff --git a/lacme b/lacme
index 2d9202d..b52cddd 100755
--- a/lacme
+++ b/lacme
@@ -689,7 +689,8 @@ sub install_cert(%) {
 
         my $mode;
         if ((my $m = $args{mode}) ne "") {
-            $mode = oct($m) // die;
+            die "Not an octal string: $m\n" unless $m =~ /^[0-9]+$/;
+            $mode = oct($m);
         } else {
             my $umask = umask() // die;
             $mode = 0644 &~ $umask;