Fix buffer size in getgrnam_r

diff --git a/src/if-options.c b/src/if-options.c
index f2fb205bee7d25c195bbf94eb0b5c0310f31ee5b..3d9646a4784e32d0bf9bf0a297f7497c0c211153 100644 (file)
--- a/src/if-options.c
+++ b/src/if-options.c
@@ -2095,7 +2095,7 @@ invalid_token:
                        logerr(__func__);
                        return -1;
                }
-               while ((i = getgrnam_r(arg, &grpbuf, p, (size_t)l, &grp)) ==
+               while ((i = getgrnam_r(arg, &grpbuf, p, dl, &grp)) ==
                    ERANGE)
                {
                        size_t nl = dl * 2;