From: Thomas Weißschuh <thomas@t-8ch.de>
Date: Tue, 26 Dec 2023 10:18:00 +0000 (+0100)
Subject: cal: avoid out of bound write
X-Git-Tag: v2.40-rc1~84^2~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1be53cb47e5e94f5efecaf6ebc55311493343183;p=thirdparty%2Futil-linux.git

cal: avoid out of bound write

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
---

diff --git a/misc-utils/cal.c b/misc-utils/cal.c
index 693449dbc6..e6f4a6e4f3 100644
--- a/misc-utils/cal.c
+++ b/misc-utils/cal.c
@@ -692,9 +692,9 @@ static void headers_init(struct cal_control *ctl)
 	for (i = 0; i < DAYS_IN_WEEK; i++) {
 		size_t space_left;
 
-		if (i)
-			strcat(cur_dh++, " ");
 		space_left = sizeof(day_headings) - (cur_dh - day_headings);
+		if (i && space_left)
+			strncat(cur_dh++, " ", space_left--);
 
 		if (space_left <= (ctl->day_width - 1))
 			break;