If the received NTP message from server didn't fit to our buffer, either
it is doing something nasty or we don't know the protocol. Consider the
packet as invalid.
---
src/timesync/timesyncd-manager.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/timesync/timesyncd-manager.c b/src/timesync/timesyncd-manager.c
index 117ea8c..e183f96 100644
--- a/src/timesync/timesyncd-manager.c
+++ b/src/timesync/timesyncd-manager.c
@@ -525,7 +525,8 @@ static int manager_receive_response(sd_event_source
*source, int fd, uint32_t re
return manager_connect(m);
}
- if (iov.iov_len < sizeof(struct ntp_msg)) {
+ /* Too short or too long packet? */
+ if (iov.iov_len < sizeof(struct ntp_msg) || msghdr.msg_flags &
MSG_TRUNC) {
log_warning("Invalid response from server. Disconnecting.");
return manager_connect(m);
}
--
2.1.4
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