From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 31E7AC3A59F for ; Thu, 29 Aug 2019 18:18:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0ACF82166E for ; Thu, 29 Aug 2019 18:18:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567102714; bh=D22k3r46Zb5QFczzA77YHEXHotFNIJZqhiXYajFYR64=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WZPSLy2LMUfxqpLdVWmyRAKjMRZ27loBq14P+ErNYfVGN3ofVvHp7JWmnT6hH3Cd4 1I7ZrJ+leGT49f2zUDpSZ65wytH3Hn7fhECyQ7N0LYvc9v0Yo8ZKoQKI0mqkyCUCLF JFOxn198xwTNB+p7RUojObly8ZpvEzNNoYKCF1FU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729782AbfH2SSY (ORCPT ); Thu, 29 Aug 2019 14:18:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:60502 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730389AbfH2SSR (ORCPT ); Thu, 29 Aug 2019 14:18:17 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 13FCD2339E; Thu, 29 Aug 2019 18:18:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567102696; bh=D22k3r46Zb5QFczzA77YHEXHotFNIJZqhiXYajFYR64=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QkfoT6ZYcCgLJ7GTbcs+EVasaEUYLhQlToffyJA9Pi3OEY6kiu5MkrvHbZuFQW68K V7GgSf3ncX+hgq94wQ/BDwOUj/xL4od5PFcPDZ8OcdAdTaAjnzS2p/4oWNLgpnIxuo Xxy2vQVkxGJJUdUJ/uuyHfm0DFviKmryocDjZEes= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tho Vu , Kazuya Mizuguchi , Simon Horman , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org, linux-sh@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 11/15] ravb: Fix use-after-free ravb_tstamp_skb Date: Thu, 29 Aug 2019 14:17:58 -0400 Message-Id: <20190829181802.9619-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190829181802.9619-1-sashal@kernel.org> References: <20190829181802.9619-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tho Vu [ Upstream commit cfef46d692efd852a0da6803f920cc756eea2855 ] When a Tx timestamp is requested, a pointer to the skb is stored in the ravb_tstamp_skb struct. This was done without an skb_get. There exists the possibility that the skb could be freed by ravb_tx_free (when ravb_tx_free is called from ravb_start_xmit) before the timestamp was processed, leading to a use-after-free bug. Use skb_get when filling a ravb_tstamp_skb struct, and add appropriate frees/consumes when a ravb_tstamp_skb struct is freed. Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Signed-off-by: Tho Vu Signed-off-by: Kazuya Mizuguchi Signed-off-by: Simon Horman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 29d31eb995d7f..fedfd94699cb8 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1,6 +1,6 @@ /* Renesas Ethernet AVB device driver * - * Copyright (C) 2014-2015 Renesas Electronics Corporation + * Copyright (C) 2014-2019 Renesas Electronics Corporation * Copyright (C) 2015 Renesas Solutions Corp. * Copyright (C) 2015 Cogent Embedded, Inc. * @@ -501,7 +501,10 @@ static void ravb_get_tx_tstamp(struct net_device *ndev) kfree(ts_skb); if (tag == tfa_tag) { skb_tstamp_tx(skb, &shhwtstamps); + dev_consume_skb_any(skb); break; + } else { + dev_kfree_skb_any(skb); } } ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR); @@ -1382,7 +1385,7 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) DMA_TO_DEVICE); goto unmap; } - ts_skb->skb = skb; + ts_skb->skb = skb_get(skb); ts_skb->tag = priv->ts_skb_tag++; priv->ts_skb_tag &= 0x3ff; list_add_tail(&ts_skb->list, &priv->ts_skb_list); @@ -1514,6 +1517,7 @@ static int ravb_close(struct net_device *ndev) /* Clear the timestamp list */ list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) { list_del(&ts_skb->list); + kfree_skb(ts_skb->skb); kfree(ts_skb); } -- 2.20.1