From f24a5f23f52eb2d877041ad977b498a980ae6f85 Mon Sep 17 00:00:00 2001
From: Johan Malm <jgm323@gmail.com>
Date: Thu, 7 Nov 2024 21:08:09 +0000
Subject: [PATCH] buf.c: fix off by one bug in buf_add_char()

Written-by: @johanmalm

Fixes: #2313

Backported from 7e50c60b003618729554777e61abda6ca935dc4b
---
 src/common/buf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/common/buf.c b/src/common/buf.c
index ecdddc6e..76f5c833 100644
--- a/src/common/buf.c
+++ b/src/common/buf.c
@@ -111,7 +111,7 @@ buf_add(struct buf *s, const char *data)
 void
 buf_add_char(struct buf *s, char ch)
 {
-	buf_expand(s, s->len + 1);
+	buf_expand(s, s->len + 2);
 	s->data[s->len++] = ch;
 	s->data[s->len] = '\0';
 }