netdev - [PATCH iproute2] lnstat:fix buffer overflow in lnstat lnstat segfaults when called the following command: $ lnstat -w 1

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Message-ID: <6cc4b6c9c31e49508c07df7334831a73@huawei.com>
Date:   Mon, 15 Nov 2021 11:27:34 +0000
From:   "jiangheng (H)" <jiangheng12@...wei.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "Chenxiang (EulerOS)" <rose.chen@...wei.com>
Subject: [PATCH iproute2] lnstat:fix buffer overflow in lnstat lnstat
 segfaults when called the following command: $ lnstat -w 1

>From d797c268003919f6e83c1bbdccebf62805dc2581 Mon Sep 17 00:00:00 2001
From: jiangheng <jiangheng12@...wei.com>
Date: Thu, 11 Nov 2021 18:20:26 +0800
Subject: [PATCH iproute2] lnstat:fix buffer overflow in lnstat lnstat
segfaults when called the following command: $ lnstat -w 1

[root@...104 conf.d]# lnstat -w 1
Segmentation fault (core dumped)

The maximum  value of th.num_lines is HDR_LINES(10),  h should not be equal to th.num_lines, array th.hdr may be out of bounds.

Signed-off-by jiangheng <jiangheng12@...wei.com>
---
misc/lnstat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/misc/lnstat.c b/misc/lnstat.c
index 89cb0e7e..26be852d 100644
--- a/misc/lnstat.c
+++ b/misc/lnstat.c
@@ -211,7 +211,7 @@ static struct table_hdr *build_hdr_string(struct lnstat_file *lnstat_files,
 		ofs += width+1;
 	}
 	/* fill in spaces */
-	for (h = 1; h <= th.num_lines; h++) {
+	for (h = 1; h < th.num_lines; h++) {
 		for (i = 0; i < ofs; i++) {
 			if (th.hdr[h][i] == '\0')
 				th.hdr[h][i] = ' ';
--
2.27.0