linux-kernel - [PATCH 4.14 170/237] net/sched: flower: add missing validation of TCA_FLOWER

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Message-Id: <20200227132308.950159073@linuxfoundation.org>
Date:   Thu, 27 Feb 2020 14:36:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Davide Caratti <dcaratti@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 170/237] net/sched: flower: add missing validation of TCA_FLOWER_FLAGS

From: Davide Caratti <dcaratti@...hat.com>

[ Upstream commit e2debf0852c4d66ba1a8bde12869b196094c70a7 ]

unlike other classifiers that can be offloaded (i.e. users can set flags
like 'skip_hw' and 'skip_sw'), 'cls_flower' doesn't validate the size of
netlink attribute 'TCA_FLOWER_FLAGS' provided by user: add a proper entry
to fl_policy.

Fixes: 5b33f48842fa ("net/flower: Introduce hardware offload support")
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/cls_flower.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -445,6 +445,7 @@ static const struct nla_policy fl_policy
 	[TCA_FLOWER_KEY_IP_TOS_MASK]	= { .type = NLA_U8 },
 	[TCA_FLOWER_KEY_IP_TTL]		= { .type = NLA_U8 },
 	[TCA_FLOWER_KEY_IP_TTL_MASK]	= { .type = NLA_U8 },
+	[TCA_FLOWER_FLAGS]		= { .type = NLA_U32 },
 };
 
 static void fl_set_key_val(struct nlattr **tb,