From c08fbb86648b2c1c131df5066b6352cf96e245fb Mon Sep 17 00:00:00 2001
From: achillelamb <achille.lambrughi98@gmail.com>
Date: Fri, 4 Oct 2024 16:32:00 +0200
Subject: fix(ppp_lcp): truncate echo reply if size > client MRU

Fix issue #204
Proposed by https://github.com/achillelamb
---
 accel-pppd/ppp/ppp_lcp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'accel-pppd')

diff --git a/accel-pppd/ppp/ppp_lcp.c b/accel-pppd/ppp/ppp_lcp.c
index 10babec8..c5f9f2de 100644
--- a/accel-pppd/ppp/ppp_lcp.c
+++ b/accel-pppd/ppp/ppp_lcp.c
@@ -16,6 +16,10 @@
 
 #include "memdebug.h"
 
+#ifndef min
+#define min(x,y) ((x)<(y)?(x):(y))
+#endif
+
 struct recv_opt_t
 {
 	struct list_head entry;
@@ -615,7 +619,7 @@ static void send_echo_reply(struct ppp_lcp_t *lcp)
 	if (conf_ppp_verbose)
 		log_ppp_debug("send [LCP EchoRep id=%x <magic %08x>]\n", hdr->id, lcp->magic);
 
-	ppp_chan_send(lcp->ppp, hdr, ntohs(hdr->len) + 2);
+	ppp_chan_send(lcp->ppp, hdr, min(ntohs(hdr->len), lcp->ppp->mtu) + 2);
 }
 
 static void send_echo_request(struct triton_timer_t *t)
-- 
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