From efe78e7e5b9e6c3e4916c6d3a722d16f785b2ec3 Mon Sep 17 00:00:00 2001
From: Simon Goldschmidt <goldsimon@gmx.de>
Date: Thu, 12 Oct 2023 21:34:11 +0200
Subject: [PATCH] pbuf_cat: add a simple check to ensure we don't cat the same
 pbuf to itself

---
 src/core/pbuf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core/pbuf.c b/src/core/pbuf.c
index ad3995b1..54a6e0e4 100644
--- a/src/core/pbuf.c
+++ b/src/core/pbuf.c
@@ -860,6 +860,7 @@ pbuf_cat(struct pbuf *h, struct pbuf *t)
 
   LWIP_ERROR("(h != NULL) && (t != NULL) (programmer violates API)",
              ((h != NULL) && (t != NULL)), return;);
+  LWIP_ASSERT("Creating an infinite loop", h != t);
 
   /* proceed to last pbuf of chain */
   for (p = h; p->next != NULL; p = p->next) {