From patchwork Thu Nov 19 01:52:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jia-Ju Bai X-Patchwork-Id: 329659 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 01BC6C64E69 for ; Thu, 19 Nov 2020 01:52:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B192246B0 for ; Thu, 19 Nov 2020 01:52:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="at1kCgQJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727621AbgKSBwO (ORCPT ); Wed, 18 Nov 2020 20:52:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726413AbgKSBwN (ORCPT ); Wed, 18 Nov 2020 20:52:13 -0500 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8681CC0617A7; Wed, 18 Nov 2020 17:52:13 -0800 (PST) Received: by mail-pg1-x543.google.com with SMTP id m9so2762939pgb.4; Wed, 18 Nov 2020 17:52:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=9025Wc1+t1+Asl4+HE2JiiCcXuZsf9kAEp5Y/mjiQ7I=; b=at1kCgQJTObwy+2jmdlGcjwCXnikQgSV4v9IToVIQLPzLOrm5dSm8lc9gDsISjJpoy kq4DbGbvQ0xnuRXX6nyMsAGyPuEpuUyewplrqz1fSuPaKofSELvTLTw6E+g1SjQbXPac CzOxnVHGN/IUkgzigWpAVtQ2SQaPNHzsudK009LbTx9t+BaoD3E2FR3GvjLjqbRLGUDr EF91MyNDe5Te8ikU5YxBWPft5RiojerqB934+BjIuPUNh2L2I1kfIlwJUN+xSs3bS+Ze R9lqmbFLPCGqHVr7uSpUzku4tRxQOkPIMwdCZUnD194tCquZ9l5UwwaR+BU2nJErxn1J E1YA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=9025Wc1+t1+Asl4+HE2JiiCcXuZsf9kAEp5Y/mjiQ7I=; b=D43soLDih5auf9lmFmGJXMtsHZkiB2+oqDAuDonFa8meLnz4siP/HBvFglra16zZgZ e108XCol5Uu2osq/eW5SUtcDt+NY+bEy8CYoWx5rWmWSJ4o2L2uTawYv6DwlG9NE4LL0 CdCDhWIjjUegkfBP5KhYjtvw2euEsOZbpVETiI8P0rmjJ7x0ceD+XQjb2Jc7vjxBDE5p RSDhbDVgbuZ6d0bb16KfjyX9vez5YegBLLv1dbxnFd0DkJOz9KA04qz95usG8PBz5ssZ es0Ei8Lrh4jqHphCtnNmhaaDf6tGtfaZzrTR4PCIRVpiPV2UJquGqRk/qdct8oD7AXZ6 sAPA== X-Gm-Message-State: AOAM530oVuMTGBctJf5AKGWRgweSY1IcFJwHIbSfp1UUWSRqpVYbSX+a M9p6T+DwUObof+I9mn1wYYw= X-Google-Smtp-Source: ABdhPJzICtfYjpI2GQXdBLTyYUvqqtGVGQDEQFhVQmIYp6gzD2kN/3XYB3VuQyBHlPbYZo6seRxoXg== X-Received: by 2002:a17:90a:fa04:: with SMTP id cm4mr1815855pjb.24.1605750733194; Wed, 18 Nov 2020 17:52:13 -0800 (PST) Received: from localhost.localdomain ([45.56.153.149]) by smtp.gmail.com with ESMTPSA id o62sm4038168pjo.7.2020.11.18.17.52.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Nov 2020 17:52:12 -0800 (PST) From: Jia-Ju Bai To: pkshih@realtek.com, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org, Larry.Finger@lwfinger.net Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jia-Ju Bai Subject: [PATCH v2 3/4 resend] rtlwifi: rtl8192de: avoid accessing the data mapped to streaming DMA Date: Thu, 19 Nov 2020 09:52:05 +0800 Message-Id: <20201119015205.12162-1-baijiaju1990@gmail.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In rtl92de_tx_fill_cmddesc(), skb->data is mapped to streaming DMA on line 667: dma_addr_t mapping = dma_map_single(..., skb->data, ...); On line 669, skb->data is assigned to hdr after cast: struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); Then hdr->frame_control is accessed on line 670: __le16 fc = hdr->frame_control; This DMA access may cause data inconsistency between CPU and hardwre. To fix this bug, hdr->frame_control is accessed before the DMA mapping. Signed-off-by: Jia-Ju Bai --- v2: * Use "rtlwifi" as subject prefix and have all rtlwifi patches in the same pathset. Thank Ping and Larry for good advice. --- drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c index 8944712274b5..c02813fba934 100644 --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/trx.c @@ -664,12 +664,14 @@ void rtl92de_tx_fill_cmddesc(struct ieee80211_hw *hw, struct rtl_ps_ctl *ppsc = rtl_psc(rtlpriv); struct rtl_hal *rtlhal = rtl_hal(rtlpriv); u8 fw_queue = QSLT_BEACON; - dma_addr_t mapping = dma_map_single(&rtlpci->pdev->dev, skb->data, - skb->len, DMA_TO_DEVICE); + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); __le16 fc = hdr->frame_control; __le32 *pdesc = (__le32 *)pdesc8; + dma_addr_t mapping = dma_map_single(&rtlpci->pdev->dev, skb->data, + skb->len, DMA_TO_DEVICE); + if (dma_mapping_error(&rtlpci->pdev->dev, mapping)) { rtl_dbg(rtlpriv, COMP_SEND, DBG_TRACE, "DMA mapping error\n");