From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 9 Jan 2023 02:22:22 +0000 (+1030)
Subject: stringbuilder: avoid overwriting end of buffer with nul terminator.
X-Git-Url: http://git.ozlabs.org/?a=commitdiff_plain;ds=sidebyside;h=1ee3028a58e7c4a78491dd07a97feaecbdf5731f;p=ccan

stringbuilder: avoid overwriting end of buffer with nul terminator.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

diff --git a/ccan/stringbuilder/stringbuilder.c b/ccan/stringbuilder/stringbuilder.c
index d34de811..8eb4ab42 100644
--- a/ccan/stringbuilder/stringbuilder.c
+++ b/ccan/stringbuilder/stringbuilder.c
@@ -22,7 +22,8 @@ static int stringbuilder_cpy(
 	if (*str != s) {
 		if (!s_len)
 			s_len = strlen(s);
-		if (s_len > *str_sz)
+		/* Include nul term! */
+		if (s_len >= *str_sz)
 			return EMSGSIZE;
 		strcpy(*str, s);
 	}