From 532023f7b63e9611b2f0fdfe7de8f149864eb188 Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@sudo.ws>
Date: Wed, 4 Jan 2023 10:36:09 -0700
Subject: [PATCH] sudo_lbuf_expand: don't allocate less than 256 bytes at a
 time.

---
 lib/util/lbuf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/util/lbuf.c b/lib/util/lbuf.c
index c2a83760b..34c2a343b 100644
--- a/lib/util/lbuf.c
+++ b/lib/util/lbuf.c
@@ -77,9 +77,11 @@ sudo_lbuf_expand(struct sudo_lbuf *lbuf, unsigned int extra)
     }
 
     if (lbuf->len + extra + 1 > lbuf->size) {
-	const unsigned int new_size = sudo_pow2_roundup(lbuf->len + extra + 1);
+	unsigned int new_size = sudo_pow2_roundup(lbuf->len + extra + 1);
 	char *new_buf;
 
+	if (new_size < 256)
+	    new_size = 256;
 	if ((new_buf = realloc(lbuf->buf, new_size)) == NULL) {
 	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
 		"unable to allocate memory");