From patchwork Wed Nov 18 16:36:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Davide Caratti X-Patchwork-Id: 1402394 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=N/Qv7gll; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CbpQV2tBdz9sPB for ; Thu, 19 Nov 2020 03:38:10 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727132AbgKRQhc (ORCPT ); Wed, 18 Nov 2020 11:37:32 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:32412 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726644AbgKRQhb (ORCPT ); Wed, 18 Nov 2020 11:37:31 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605717450; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ztnJJHYZImRgMl6CCHOU5sg0a/4NjPVLA/Is2Wx7Dq8=; b=N/Qv7gllLp/yQTS2gsVoOvaMPC0RB2onsvm3EShWz1i2XrXqsgtSsho+vdxt081xoKjn7A JHWi1/BNzNfXnak1m735vpshQ4fL3eumxupPZEtWD0xjuj/+dlj8PKJ3s+i1rSvU3bpH1B hvrueIHDRbiS/kot4gSBFxEbC7C2Tew= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-285-puSDo0WXPwi2LnBDdvPxww-1; Wed, 18 Nov 2020 11:37:26 -0500 X-MC-Unique: puSDo0WXPwi2LnBDdvPxww-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C00AF10509F6; Wed, 18 Nov 2020 16:37:19 +0000 (UTC) Received: from new-host-6.redhat.com (unknown [10.40.195.8]) by smtp.corp.redhat.com (Postfix) with ESMTP id 10E7D1F0; Wed, 18 Nov 2020 16:37:17 +0000 (UTC) From: Davide Caratti To: Jamal Hadi Salim , Cong Wang , Jiri Pirko , netdev@vger.kernel.org, Jakub Kicinski Cc: gnault@redhat.com, marcelo.leitner@gmail.com Subject: [PATCH net] net/sched: act_mpls: ensure LSE is pullable before reading it Date: Wed, 18 Nov 2020 17:36:52 +0100 Message-Id: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org when 'act_mpls' is used to mangle the LSE, the current value is read from the packet with mpls_hdr(): ensure that the label is contained in the skb "linear" area. Found by code inspection. Fixes: 2a2ea50870ba ("net: sched: add mpls manipulation actions to TC") Signed-off-by: Davide Caratti Reviewed-by: Marcelo Ricardo Leitner --- 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..03138ad59e9b 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) + sizeof(new_lse))) + goto drop; new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false); if (skb_mpls_update_lse(skb, new_lse)) goto drop;