linux-kernel - [PATCH net-next v2 2/3] netlink: set bad attribute also on maxtype check

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Message-Id: <b10cbb009c6ea4acf02df7cac4972870b1c89eb8.1556806084.git.mkubecek@suse.cz>
Date:   Thu,  2 May 2019 16:15:10 +0200 (CEST)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Johannes Berg <johannes@...solutions.net>,
        David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 2/3] netlink: set bad attribute also on maxtype check

The check that attribute type is within 0...maxtype range in
__nla_validate_parse() sets only error message but not bad_attr in extack.
Set also bad_attr to tell userspace which attribute failed validation.

Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
Reviewed-by: Johannes Berg <johannes@...solutions.net>
Reviewed-by: David Ahern <dsahern@...il.com>
---
 lib/nlattr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/nlattr.c b/lib/nlattr.c
index 29f6336e2422..adc919b32bf9 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -356,7 +356,8 @@ static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype,
 
 		if (type == 0 || type > maxtype) {
 			if (validate & NL_VALIDATE_MAXTYPE) {
-				NL_SET_ERR_MSG(extack, "Unknown attribute type");
+				NL_SET_ERR_MSG_ATTR(extack, nla,
+						    "Unknown attribute type");
 				return -EINVAL;
 			}
 			continue;
-- 
2.21.0