From patchwork Mon Feb 7 20:24:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 540730 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 3030FC4167E for ; Mon, 7 Feb 2022 20:28:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232627AbiBGU2T (ORCPT ); Mon, 7 Feb 2022 15:28:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232919AbiBGUY0 (ORCPT ); Mon, 7 Feb 2022 15:24:26 -0500 Received: from mail-lj1-x233.google.com (mail-lj1-x233.google.com [IPv6:2a00:1450:4864:20::233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E81EC0401DA; Mon, 7 Feb 2022 12:24:25 -0800 (PST) Received: by mail-lj1-x233.google.com with SMTP id c15so21337953ljf.11; Mon, 07 Feb 2022 12:24:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0QZUBGn5Vf3a75LS52BCKhCqw6Mtv6YRAewQwFkN9YU=; b=HhaDozkIYW6SQNj1SQEVEcn2tye5SwdgIeieSdv/hIXRvmL1r923vLwDCNEEGwxBgy ejLv9/tQuSRFUF6C7yjnA3fjs9L1IZyReulArI7kR7mayrLqFa+Pu+f1s6gYvelTFBt4 hKPqwWco2L3GIx8GWLseYf5rrUEGQKsJFMY0Jhq9deKERJj8heycEDGAXc6H2Mlq8GUJ KWLysWMrukYAbLX/0qbqPZ3ZcmXbbq6Pt85S7Edf48M0a1LqXGXmv5gXzx4AHPW06Sb2 Tfogob6yzAnGUGavRbX4E61OEUFN9jaWmhYiqYCD3J2RRxJeibyNkh7HBXNBFzbTkg65 raiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0QZUBGn5Vf3a75LS52BCKhCqw6Mtv6YRAewQwFkN9YU=; b=Xrqxxh0nU7e/xPggz6YBaLVbFHCaTbKhA+9J275ZHIqGcCKjL3jZxntApVSNz5NjgC 21WPRwAVDnZgsw7Y74uGrwUllrtBogWHQGEWuLHAJ7qFvtBVr2XfzND6X0300NaQlSeD n6eTzsGgY2iR4zykNjWRY3OSfgllVfaVj/ErKvMlUzdNUquDmsijYtIgBhHcM0ZoP7jM pqxBMN0JeI4KuJKe6+bjBxdSC1IPAkMYxmsD01jLZ3OF5Uf9zacjm+fIXaWraa6RdcHS NF8pgT/pjVJEivAJv4pLGl536KV3BlqfFQNE4K8uW7EH8l2A3rfoUCJWicxZR+vc6k7e BCXw== X-Gm-Message-State: AOAM531Y7GuYkyLrSM+MC9p0uAhECLXt1iZLj2sSYcIayRP+j5l7NaFz A6Gz0MT2e8T25VVi8MDInRo= X-Google-Smtp-Source: ABdhPJz4tTPcQksNjB3XhXBM2BhaAlFbe5VIPLCf72OHyrbnaTGpDRyfcnx/8nTl/uDcOydHOb1FUw== X-Received: by 2002:a2e:8447:: with SMTP id u7mr734250ljh.516.1644265463369; Mon, 07 Feb 2022 12:24:23 -0800 (PST) Received: from localhost.localdomain ([94.103.224.201]) by smtp.gmail.com with ESMTPSA id n16sm1625618lfq.113.2022.02.07.12.24.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Feb 2022 12:24:22 -0800 (PST) From: Pavel Skripkin To: ath9k-devel@qca.qualcomm.com, kvalo@kernel.org, davem@davemloft.net, kuba@kernel.org, toke@toke.dk, linville@tuxdriver.com Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin , syzbot+03110230a11411024147@syzkaller.appspotmail.com, syzbot+c6dde1f690b60e0b9fbe@syzkaller.appspotmail.com Subject: [PATCH v3 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx_cb Date: Mon, 7 Feb 2022 23:24:18 +0300 Message-Id: <80962aae265995d1cdb724f5362c556d494c7566.1644265120.git.paskripkin@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Syzbot reported use-after-free Read in ath9k_hif_usb_rx_cb(). The problem was in incorrect htc_handle->drv_priv initialization. Probable call trace which can trigger use-after-free: ath9k_htc_probe_device() /* htc_handle->drv_priv = priv; */ ath9k_htc_wait_for_target() <--- Failed ieee80211_free_hw() <--- priv pointer is freed ... ath9k_hif_usb_rx_cb() ath9k_hif_usb_rx_stream() RX_STAT_INC() <--- htc_handle->drv_priv access In order to not add fancy protection for drv_priv we can move htc_handle->drv_priv initialization at the end of the ath9k_htc_probe_device() and add helper macro to make all *_STAT_* macros NULL save. Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") Reported-and-tested-by: syzbot+03110230a11411024147@syzkaller.appspotmail.com Reported-and-tested-by: syzbot+c6dde1f690b60e0b9fbe@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin --- Changes since v2: - My send-email script forgot, that mailing lists exist. Added back all related lists Changes since v1: - Removed clean-ups and moved them to 2/2 --- drivers/net/wireless/ath/ath9k/htc.h | 10 +++++----- drivers/net/wireless/ath/ath9k/htc_drv_init.c | 3 ++- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h index 6b45e63fae4b..141642e5e00d 100644 --- a/drivers/net/wireless/ath/ath9k/htc.h +++ b/drivers/net/wireless/ath/ath9k/htc.h @@ -327,11 +327,11 @@ static inline struct ath9k_htc_tx_ctl *HTC_SKB_CB(struct sk_buff *skb) } #ifdef CONFIG_ATH9K_HTC_DEBUGFS - -#define TX_STAT_INC(c) (hif_dev->htc_handle->drv_priv->debug.tx_stats.c++) -#define TX_STAT_ADD(c, a) (hif_dev->htc_handle->drv_priv->debug.tx_stats.c += a) -#define RX_STAT_INC(c) (hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c++) -#define RX_STAT_ADD(c, a) (hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c += a) +#define __STAT_SAVE(expr) (hif_dev->htc_handle->drv_priv ? (expr) : 0) +#define TX_STAT_INC(c) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.tx_stats.c++) +#define TX_STAT_ADD(c, a) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.tx_stats.c += a) +#define RX_STAT_INC(c) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c++) +#define RX_STAT_ADD(c, a) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c += a) #define CAB_STAT_INC priv->debug.tx_stats.cab_queued++ #define TX_QSTAT_INC(q) (priv->debug.tx_stats.queue_stats[q]++) diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_init.c b/drivers/net/wireless/ath/ath9k/htc_drv_init.c index ff61ae34ecdf..07ac88fb1c57 100644 --- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c @@ -944,7 +944,6 @@ int ath9k_htc_probe_device(struct htc_target *htc_handle, struct device *dev, priv->hw = hw; priv->htc = htc_handle; priv->dev = dev; - htc_handle->drv_priv = priv; SET_IEEE80211_DEV(hw, priv->dev); ret = ath9k_htc_wait_for_target(priv); @@ -965,6 +964,8 @@ int ath9k_htc_probe_device(struct htc_target *htc_handle, struct device *dev, if (ret) goto err_init; + htc_handle->drv_priv = priv; + return 0; err_init: