netdev - [iproute PATCH 11/12] iptunnel: sanitize copying tunnel name

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Message-Id: <1447434545-32182-12-git-send-email-phil@nwl.cc>
Date:	Fri, 13 Nov 2015 18:09:04 +0100
From:	Phil Sutter <phil@....cc>
To:	Stephen Hemminger <shemming@...cade.com>
Cc:	netdev@...r.kernel.org
Subject: [iproute PATCH 11/12] iptunnel: sanitize copying tunnel name

Since p->name is only IFNAMSIZ bytes, do not copy more than IFNAMSIZ - 1
bytes into it so there remains at least a single null byte in the end.

Signed-off-by: Phil Sutter <phil@....cc>
---
 ip/iptunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ip/iptunnel.c b/ip/iptunnel.c
index 3b46a15..b377a5b 100644
--- a/ip/iptunnel.c
+++ b/ip/iptunnel.c
@@ -175,7 +175,7 @@ static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
 				usage();
 			if (p->name[0])
 				duparg2("name", *argv);
-			strncpy(p->name, *argv, IFNAMSIZ);
+			strncpy(p->name, *argv, IFNAMSIZ - 1);
 			if (cmd == SIOCCHGTUNNEL && count == 0) {
 				struct ip_tunnel_parm old_p;
 				memset(&old_p, 0, sizeof(old_p));
-- 
2.1.2

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