netdev - [PATCH net v2] net/sched: act_mpls: ensure LSE is pullable before reading it

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Message-Id: <3243506cba43d14858f3bd21ee0994160e44d64a.1606987058.git.dcaratti@redhat.com>
Date:   Thu,  3 Dec 2020 10:37:52 +0100
From:   Davide Caratti <dcaratti@...hat.com>
To:     jhs@...atatu.com, jiri@...nulli.us,
        Cong Wang <xiyou.wangcong@...il.com>, kuba@...nel.org,
        netdev@...r.kernel.org
Cc:     gnault@...hat.com, marcelo.leitner@...il.com,
        John Hurley <john.hurley@...ronome.com>
Subject: [PATCH net v2] net/sched: act_mpls: ensure LSE is pullable before reading it

when 'act_mpls' is used to mangle the LSE, the current value is read from
the packet dereferencing 4 bytes at mpls_hdr(): ensure that the label is
contained in the skb "linear" area.

Found by code inspection.

v2:
 - use MPLS_HLEN instead of sizeof(new_lse), thanks to Jakub Kicinski

Fixes: 2a2ea50870ba ("net: sched: add mpls manipulation actions to TC")
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 net/sched/act_mpls.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sched/act_mpls.c b/net/sched/act_mpls.c
index 5c7456e5b5cf..d1486ea496a2 100644
--- a/net/sched/act_mpls.c
+++ b/net/sched/act_mpls.c
@@ -105,6 +105,9 @@ static int tcf_mpls_act(struct sk_buff *skb, const struct tc_action *a,
 			goto drop;
 		break;
 	case TCA_MPLS_ACT_MODIFY:
+		if (!pskb_may_pull(skb,
+				   skb_network_offset(skb) + MPLS_HLEN))
+			goto drop;
 		new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
 		if (skb_mpls_update_lse(skb, new_lse))
 			goto drop;
-- 
2.28.0