From: Guus Sliepen <guus@sliepen.org>
Date: Sat, 11 Apr 2020 22:38:54 +0000 (+0200)
Subject: Handle the case where we reduce the buffer size below the amount currently used.
X-Git-Url: http://git.meshlink.io/?p=utcp;a=commitdiff_plain;h=9fe3be0ad54dd1e0c8766957ea402d555d947839

Handle the case where we reduce the buffer size below the amount currently used.
---

diff --git a/utcp.c b/utcp.c
index 75d4f83..6279d92 100644
--- a/utcp.c
+++ b/utcp.c
@@ -401,7 +401,7 @@ static void buffer_exit(struct buffer *buf) {
 }
 
 static uint32_t buffer_free(const struct buffer *buf) {
-	return buf->maxsize - buf->used;
+	return buf->maxsize > buf->used ? buf->maxsize - buf->used : 0;
 }
 
 // Connections are stored in a sorted list.