From patchwork Tue Mar 17 10:54:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 229338 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97BA4C2BB1D for ; Tue, 17 Mar 2020 11:01:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C60120738 for ; Tue, 17 Mar 2020 11:01:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584442884; bh=3Y4o0zkAAx4w7nT0/92lZVUxZqHkHmhBWM1INk7CGqQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eerdUjSXXjXY36v6H2OpwdIyZHXw17wyspmKdH4uXDYRgOxIw1z7blhSzfx2quJED +96YqYTulM0xY6S/n2+qsbZH5lyrp33AopOsMR4jJGpm7EuiMBkuh/934HlCWNABsP vtPKgomKTjnrNpZAwWKAQ+MA2sFyDg7nEPU+7QKQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727283AbgCQLBX (ORCPT ); Tue, 17 Mar 2020 07:01:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:40738 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726574AbgCQLBX (ORCPT ); Tue, 17 Mar 2020 07:01:23 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C613C20719; Tue, 17 Mar 2020 11:01:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584442881; bh=3Y4o0zkAAx4w7nT0/92lZVUxZqHkHmhBWM1INk7CGqQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CcOERSpJvQ+U3uY54s+/1iofLPtWmKjJoB+80gUH5eMzNnRNNKC3qV+lBA+6FB3Px HSmlhta4MhLnvWhO2oOoq2rpi54fT5F+zxxYQ3wRY5TF9OC84uVcYdBQ/9LvRe9tZR Vn90gTWNhaszzXoKyASW11P9Y1Ifk28bPhl7YhN8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Willem de Bruijn , "David S. Miller" Subject: [PATCH 5.4 022/123] net/packet: tpacket_rcv: do not increment ring index on drop Date: Tue, 17 Mar 2020 11:54:09 +0100 Message-Id: <20200317103310.039870642@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200317103307.343627747@linuxfoundation.org> References: <20200317103307.343627747@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Willem de Bruijn [ Upstream commit 46e4c421a053c36bf7a33dda2272481bcaf3eed3 ] In one error case, tpacket_rcv drops packets after incrementing the ring producer index. If this happens, it does not update tp_status to TP_STATUS_USER and thus the reader is stalled for an iteration of the ring, causing out of order arrival. The only such error path is when virtio_net_hdr_from_skb fails due to encountering an unknown GSO type. Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/packet/af_packet.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2273,6 +2273,13 @@ static int tpacket_rcv(struct sk_buff *s TP_STATUS_KERNEL, (macoff+snaplen)); if (!h.raw) goto drop_n_account; + + if (do_vnet && + virtio_net_hdr_from_skb(skb, h.raw + macoff - + sizeof(struct virtio_net_hdr), + vio_le(), true, 0)) + goto drop_n_account; + if (po->tp_version <= TPACKET_V2) { packet_increment_rx_head(po, &po->rx_ring); /* @@ -2285,12 +2292,6 @@ static int tpacket_rcv(struct sk_buff *s status |= TP_STATUS_LOSING; } - if (do_vnet && - virtio_net_hdr_from_skb(skb, h.raw + macoff - - sizeof(struct virtio_net_hdr), - vio_le(), true, 0)) - goto drop_n_account; - po->stats.stats1.tp_packets++; if (copy_skb) { status |= TP_STATUS_COPY;