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=-13.1 required=3.0 tests=BAYES_00,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 B784AC43457 for ; Sun, 18 Oct 2020 19:23:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C9ED20791 for ; Sun, 18 Oct 2020 19:23:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603049013; bh=1/zcvT49Z0HRAXBRD5R7Zp7EgSGSNvitNfefz2WUyTM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fUklD/MiTBQtrR7n6aaRVocoi3+0NGx65zwC87L5WXhjewaQhFTb66kMJaBXalh2g A49sGCO/bQhmChqM2TKxLsTRzNdCrhkHxn9AigGH1RDnjE2+Jy5x56LdDCEEZnwFOp dtYvPBSSRD10VG+Y/t+kwejkTC5k1zF0vLDeg4sw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730335AbgJRTXc (ORCPT ); Sun, 18 Oct 2020 15:23:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:36732 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730325AbgJRTX3 (ORCPT ); Sun, 18 Oct 2020 15:23:29 -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 8C606222C8; Sun, 18 Oct 2020 19:23:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603049008; bh=1/zcvT49Z0HRAXBRD5R7Zp7EgSGSNvitNfefz2WUyTM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WOgeM6ALvQaxzPgLMCauM9V9KtLCY7BhG5YNXUL511ZPgTE102M4+JGmjUWNJWTA3 67moBL2/QIl5tgmiW7XSjNoZOcODDa4GlqjF8zVVigbr6HFalpzDMuoVECxg7xd2D3 ByAR9Uva5xJQKInKDS9Eb1sG8rZIUCXiQ11R2lhw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Brooke Basile , syzbot+89bd486af9427a9fc605@syzkaller.appspotmail.com, Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 44/80] ath9k: hif_usb: fix race condition between usb_get_urb() and usb_kill_anchored_urbs() Date: Sun, 18 Oct 2020 15:21:55 -0400 Message-Id: <20201018192231.4054535-44-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201018192231.4054535-1-sashal@kernel.org> References: <20201018192231.4054535-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Brooke Basile [ Upstream commit 03fb92a432ea5abe5909bca1455b7e44a9380480 ] Calls to usb_kill_anchored_urbs() after usb_kill_urb() on multiprocessor systems create a race condition in which usb_kill_anchored_urbs() deallocates the URB before the completer callback is called in usb_kill_urb(), resulting in a use-after-free. To fix this, add proper lock protection to usb_kill_urb() calls that can possibly run concurrently with usb_kill_anchored_urbs(). Reported-by: syzbot+89bd486af9427a9fc605@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=cabffad18eb74197f84871802fd2c5117b61febf Signed-off-by: Brooke Basile Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20200911071427.32354-1-brookebasile@gmail.com Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath9k/hif_usb.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c index 3f563e02d17da..2ed98aaed6fb5 100644 --- a/drivers/net/wireless/ath/ath9k/hif_usb.c +++ b/drivers/net/wireless/ath/ath9k/hif_usb.c @@ -449,10 +449,19 @@ static void hif_usb_stop(void *hif_handle) spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); /* The pending URBs have to be canceled. */ + spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); list_for_each_entry_safe(tx_buf, tx_buf_tmp, &hif_dev->tx.tx_pending, list) { + usb_get_urb(tx_buf->urb); + spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); usb_kill_urb(tx_buf->urb); + list_del(&tx_buf->list); + usb_free_urb(tx_buf->urb); + kfree(tx_buf->buf); + kfree(tx_buf); + spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); } + spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); usb_kill_anchored_urbs(&hif_dev->mgmt_submitted); } @@ -762,27 +771,37 @@ static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev) struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL; unsigned long flags; + spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); list_for_each_entry_safe(tx_buf, tx_buf_tmp, &hif_dev->tx.tx_buf, list) { + usb_get_urb(tx_buf->urb); + spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); usb_kill_urb(tx_buf->urb); list_del(&tx_buf->list); usb_free_urb(tx_buf->urb); kfree(tx_buf->buf); kfree(tx_buf); + spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); } + spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); hif_dev->tx.flags |= HIF_USB_TX_FLUSH; spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); + spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); list_for_each_entry_safe(tx_buf, tx_buf_tmp, &hif_dev->tx.tx_pending, list) { + usb_get_urb(tx_buf->urb); + spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); usb_kill_urb(tx_buf->urb); list_del(&tx_buf->list); usb_free_urb(tx_buf->urb); kfree(tx_buf->buf); kfree(tx_buf); + spin_lock_irqsave(&hif_dev->tx.tx_lock, flags); } + spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags); usb_kill_anchored_urbs(&hif_dev->mgmt_submitted); } -- 2.25.1