netdev - [PATCH 1/2] ethtool: strset: allow ETHTOOL_A_STRSET_COUNTS

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Date:   Wed,  7 Oct 2020 12:53:50 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Leon Romanovsky <leon@...nel.org>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 1/2] ethtool: strset: allow ETHTOOL_A_STRSET_COUNTS_ONLY attr

From: Johannes Berg <johannes.berg@...el.com>

The ETHTOOL_A_STRSET_COUNTS_ONLY flag attribute was previously
not allowed to be used, but now due to the policy size reduction
we would access the tb[] array out of bounds since we tried to
check for the attribute despite it not being accepted.

Fix both issues by adding it correctly to the appropriate policy.

Fixes: ff419afa4310 ("ethtool: trim policy tables")
Fixes: 71921690f974 ("ethtool: provide string sets with STRSET_GET request")
Reported-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 net/ethtool/netlink.h | 2 +-
 net/ethtool/strset.c  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 3f5719786b0f..d8efec516d86 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -347,7 +347,7 @@ extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;
 
 extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
 extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
-extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_STRINGSETS + 1];
+extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_COUNTS_ONLY + 1];
 extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1];
 extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1];
 extern const struct nla_policy ethnl_linkmodes_get_policy[ETHTOOL_A_LINKMODES_HEADER + 1];
diff --git a/net/ethtool/strset.c b/net/ethtool/strset.c
index 0734e83c674c..0baad0ce1832 100644
--- a/net/ethtool/strset.c
+++ b/net/ethtool/strset.c
@@ -103,6 +103,7 @@ const struct nla_policy ethnl_strset_get_policy[] = {
 	[ETHTOOL_A_STRSET_HEADER]	=
 		NLA_POLICY_NESTED(ethnl_header_policy),
 	[ETHTOOL_A_STRSET_STRINGSETS]	= { .type = NLA_NESTED },
+	[ETHTOOL_A_STRSET_COUNTS_ONLY]	= { .type = NLA_FLAG },
 };
 
 static const struct nla_policy get_stringset_policy[] = {
-- 
2.26.2