From 74c787f664e2cf2bbeb3e21343534d074906d16b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@des.no>
Date: Sat, 31 Mar 2012 15:34:19 +0000
Subject: [PATCH] Avoid underflow if *size == 0.

git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@536 185d5e19-27fe-0310-9dcf-9bff6b9f3609
---
 lib/openpam_straddch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/openpam_straddch.c b/lib/openpam_straddch.c
index eb65b54..f53c144 100644
--- a/lib/openpam_straddch.c
+++ b/lib/openpam_straddch.c
@@ -61,7 +61,7 @@ openpam_straddch(char **str, size_t *size, size_t *len, int ch)
 		*str = tmpstr;
 		*size = tmpsize;
 		*len = 0;
-	} else if (*len >= *size - 1) {
+	} else if (*len + 1 >= *size) {
 		/* additional space required */
 		tmpsize = *size * 2;
 		if ((tmpstr = realloc(*str, tmpsize)) == NULL) {