[monitoring-plugins] Fix possible overflow in check_ups (Fixes: #1030)

[PhiBo]

 Module: monitoring-plugins
 Branch: master
 Commit: 09bfb1b482f428b1c11f68b5be7d134ba5e3b457
 Author: PhiBo <phibo at dinotools.org>
   Date: Wed Nov 24 11:23:47 2021 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=09bfb1b

Fix possible overflow in check_ups (Fixes: #1030)

---

 plugins/check_ups.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/plugins/check_ups.c b/plugins/check_ups.c
index e9e56a5..0de37a2 100644
--- a/plugins/check_ups.c
+++ b/plugins/check_ups.c
@@ -402,7 +402,10 @@ get_ups_variable (const char *varname, char *buf, size_t buflen)
 
 	/* create the command string to send to the UPS daemon */
 	/* Add LOGOUT to avoid read failure logs */
-	sprintf (send_buffer, "GET VAR %s %s\nLOGOUT\n", ups_name, varname);
+	if (snprintf (send_buffer, sizeof(send_buffer), "GET VAR %s %s\nLOGOUT\n", ups_name, varname) >= sizeof(send_buffer)) {
+		printf("%s\n", _("UPS name to long for buffer"));
+		return ERROR;
+	}
 
 	/* send the command to the daemon and get a response back */
 	if (process_tcp_request