ntpd: do not SEGV on "-p keyno:192.168.1.1", show --help instead

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/networking/ntpd.c b/networking/ntpd.c
index 4f8607244..041cac762 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -2539,6 +2539,7 @@ static NOINLINE void ntp_init(char **argv)
                                 int key_id;
                                 peer += 6;
                                 end = strchr(peer, ':');
+                                if (!end) bb_show_usage();
                                 *end = '\0';
                                 key_id = xatou_range(peer, 1, MAX_KEY_NUMBER);
                                 *end = ':';