From 335cc8f39c75c2b7cdab8c52fe4c378929556f7e Mon Sep 17 00:00:00 2001
From: Frantisek Sumsal <frantisek@sumsal.cz>
Date: Thu, 16 Apr 2026 11:13:27 +0200
Subject: [PATCH] timesync: verify the actual size of the received data

iov.iov_len doesn't change after calling recvmsg() so it remains set to
sizeof(ntpmsg), which makes the check for a short packet always false.
Let's fix that by checking the actual size of the received data instead.
---
 src/timesync/timesyncd-manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/timesync/timesyncd-manager.c b/src/timesync/timesyncd-manager.c
index 79a9a629c1..e4f471e2aa 100644
--- a/src/timesync/timesyncd-manager.c
+++ b/src/timesync/timesyncd-manager.c
@@ -437,7 +437,7 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
         }
 
         /* Too short packet? */
-        if (iov.iov_len < sizeof(struct ntp_msg)) {
+        if ((size_t) len < sizeof(struct ntp_msg)) {
                 log_warning("Invalid response from server. Disconnecting.");
                 return manager_connect(m);
         }