From patchwork Wed Dec 5 09:54:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 1008082 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="Nd3XvDFh"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 438vKk0rm1z9s6w for ; Wed, 5 Dec 2018 20:57:30 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730239AbeLEJ4W (ORCPT ); Wed, 5 Dec 2018 04:56:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:34752 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730232AbeLEJ4U (ORCPT ); Wed, 5 Dec 2018 04:56:20 -0500 Received: from sasha-vm.mshome.net (unknown [213.57.143.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3457621508; Wed, 5 Dec 2018 09:56:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544003779; bh=Nwh9PD8NKoFZDy2/1D6J8DvNiM/sP4SmpVvqT6LfxEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nd3XvDFh4O4hKOxywB669A6h0GgRoaZmEH0WUYImE7ji5ueM7QMg2Lnq0URLCHesN J1eew4T9w+aH9q+r70GzhvZDvYbp+zQ0SvgueghfyvfLZcyLEOyldKoQNHc1Upn4Wj ykmTvEzeEODioGKxzN9QoD9nFxKu/jVy8PyjEqws= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Pan Bian , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 3.18 16/26] rapidio/rionet: do not free skb before reading its length Date: Wed, 5 Dec 2018 04:54:20 -0500 Message-Id: <20181205095430.8019-16-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181205095430.8019-1-sashal@kernel.org> References: <20181205095430.8019-1-sashal@kernel.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Pan Bian [ Upstream commit cfc435198f53a6fa1f656d98466b24967ff457d0 ] skb is freed via dev_kfree_skb_any, however, skb->len is read then. This may result in a use-after-free bug. Fixes: e6161d64263 ("rapidio/rionet: rework driver initialization and removal") Signed-off-by: Pan Bian Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/rionet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c index 18cc2c8d5447..45b939b1506d 100644 --- a/drivers/net/rionet.c +++ b/drivers/net/rionet.c @@ -215,9 +215,9 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev) * it just report sending a packet to the target * (without actual packet transfer). */ - dev_kfree_skb_any(skb); ndev->stats.tx_packets++; ndev->stats.tx_bytes += skb->len; + dev_kfree_skb_any(skb); } }