From patchwork Tue Apr 26 08:21:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 566732 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69C94C433F5 for ; Tue, 26 Apr 2022 08:24:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344799AbiDZI1p (ORCPT ); Tue, 26 Apr 2022 04:27:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344804AbiDZI1c (ORCPT ); Tue, 26 Apr 2022 04:27:32 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AAD223AA51; Tue, 26 Apr 2022 01:23:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id EF6DBB81CF5; Tue, 26 Apr 2022 08:23:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50A2BC385A0; Tue, 26 Apr 2022 08:23:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650961416; bh=tdz095G80P1i4qrgKfufNWH7/6XIFBlB7ZaGZPFwVok=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JVIqNekU/fDNUQknN6bDJ/Sx6izyPdf30M6ApsQeISPX8K7N7leAI4prGZz86D5t1 +0hGahcZhUAsNu3v3gcL42trb4DBkgqLkLrXLCeuMweBwcRXPynlawnB//vXdhYg68 +qKl20Z/V3ShJOwrm21csj4mSWO09aZfBW2RuCLM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Flavio Leitner , Hangbin Liu , "David S. Miller" , Sasha Levin Subject: [PATCH 4.9 06/24] net/packet: fix packet_sock xmit return value checking Date: Tue, 26 Apr 2022 10:21:00 +0200 Message-Id: <20220426081731.561787886@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081731.370823950@linuxfoundation.org> References: <20220426081731.370823950@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hangbin Liu [ Upstream commit 29e8e659f984be00d75ec5fef4e37c88def72712 ] packet_sock xmit could be dev_queue_xmit, which also returns negative errors. So only checking positive errors is not enough, or userspace sendmsg may return success while packet is not send out. Move the net_xmit_errno() assignment in the braces as checkpatch.pl said do not use assignment in if condition. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: Flavio Leitner Signed-off-by: Hangbin Liu Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/packet/af_packet.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index e79d6881a97e..2ae2801dd7be 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2808,8 +2808,9 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) status = TP_STATUS_SEND_REQUEST; err = po->xmit(skb); - if (unlikely(err > 0)) { - err = net_xmit_errno(err); + if (unlikely(err != 0)) { + if (err > 0) + err = net_xmit_errno(err); if (err && __packet_get_status(po, ph) == TP_STATUS_AVAILABLE) { /* skb was destructed already */ @@ -3009,8 +3010,12 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) skb->no_fcs = 1; err = po->xmit(skb); - if (err > 0 && (err = net_xmit_errno(err)) != 0) - goto out_unlock; + if (unlikely(err != 0)) { + if (err > 0) + err = net_xmit_errno(err); + if (err) + goto out_unlock; + } dev_put(dev);