options: Ensure that we correctly read auth tokens.

diff --git a/src/if-options.c b/src/if-options.c
index dd70c80656b221f16466966dc42b3ee1354bd3c7..46ea7ea0199d8b27826e2d7de2efa6d27fc38cd6 100644 (file)
--- a/src/if-options.c
+++ b/src/if-options.c
@@ -266,6 +266,8 @@ parse_str(char *sbuf, size_t slen, const char *str, int flags)
                }
        } else {
                l = (size_t)hwaddr_aton(NULL, str);
+               if (sbuf == NULL)
+                       return (ssize_t)l;
                if ((ssize_t) l != -1 && l > 1) {
                        if (l > slen) {
                                errno = ENOBUFS;