netdev - [PATCH iproute2 2/3] iplink: Process "alias" parameter correctly

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Message-Id: <1513623248-7689-3-git-send-email-serhe.popovych@gmail.com>
Date:   Mon, 18 Dec 2017 20:54:07 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2 2/3] iplink: Process "alias" parameter correctly

Do not stop parameters processing after "alias" parameter: it might
not be a last one. Seems copy pasted from "type" parameter code.

Check it's length does not exceed IFALIASZ - 1. Better we warn
than get RTNL error.

Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
---
 ip/iplink.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/ip/iplink.c b/ip/iplink.c
index 4f9c169..4c96711 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -770,11 +770,12 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req,
 			argc--; argv++;
 			break;
 		} else if (matches(*argv, "alias") == 0) {
+			len = strlen(*argv);
+			if (len >= IFALIASZ)
+				invarg("alias too long\n", *argv);
 			NEXT_ARG();
 			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
-				  *argv, strlen(*argv));
-			argc--; argv++;
-			break;
+				  *argv, len);
 		} else if (strcmp(*argv, "group") == 0) {
 			NEXT_ARG();
 			if (*group != -1)
-- 
1.7.10.4