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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 5411EC43461 for ; Tue, 8 Sep 2020 17:30:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1246620738 for ; Tue, 8 Sep 2020 17:30:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599586205; bh=aPvRp2GFGXKWnxLSh/2v5G+RNreiEk74ofFsmRYx6yc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kE1DXRXzykgTCrzoPJiEE/AeodJIDWuPHxdz2uk0RiJPSVY4l0rKS8iPAxGEP4qcS 1lGT5Iw+yfwwqRgMHP+EDSw4KpN6g0OqDV1sIzBg++ybA5DNbvJ2pJq+/znhFbLety hSIFkN+oWWtycHbwObuj6JdBiBmVC0qdLgHeqHlE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731635AbgIHR30 (ORCPT ); Tue, 8 Sep 2020 13:29:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:58190 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731542AbgIHQQJ (ORCPT ); Tue, 8 Sep 2020 12:16:09 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CD87F24835; Tue, 8 Sep 2020 15:44:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599579885; bh=aPvRp2GFGXKWnxLSh/2v5G+RNreiEk74ofFsmRYx6yc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TtoN4sLipymub9CwWq/7u8m6CLWFP5C7JvgdX1p/jq82ARqNnv44+aAnWHxo8UI4/ OYM04a0KXKYOrtN3EXd0Yd5OoUN9DegQsiwSW6FRgzZizJ+VGLoQNr2hZJGh42iJ3o JGwCMtxF7B4m9rK/xMM8TppvOoyFPtpBu+ZMnqow= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vasundhara Volam , Michael Chan , "David S. Miller" , Sasha Levin Subject: [PATCH 5.4 045/129] bnxt_en: Fix possible crash in bnxt_fw_reset_task(). Date: Tue, 8 Sep 2020 17:24:46 +0200 Message-Id: <20200908152231.953636248@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200908152229.689878733@linuxfoundation.org> References: <20200908152229.689878733@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Chan [ Upstream commit b148bb238c02f0c7797efed026e9bba5892d2172 ] bnxt_fw_reset_task() is run from a delayed workqueue. The current code is not cancelling the workqueue in the driver's .remove() method and it can potentially crash if the device is removed with the workqueue still pending. The fix is to clear the BNXT_STATE_IN_FW_RESET flag and then cancel the delayed workqueue in bnxt_remove_one(). bnxt_queue_fw_reset_work() also needs to check that this flag is set before scheduling. This will guarantee that no rescheduling will be done after it is cancelled. Fixes: 230d1f0de754 ("bnxt_en: Handle firmware reset.") Reviewed-by: Vasundhara Volam Signed-off-by: Michael Chan Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 7cb74d7a78e3c..16462d21fea38 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -1143,6 +1143,9 @@ static int bnxt_discard_rx(struct bnxt *bp, struct bnxt_cp_ring_info *cpr, static void bnxt_queue_fw_reset_work(struct bnxt *bp, unsigned long delay) { + if (!(test_bit(BNXT_STATE_IN_FW_RESET, &bp->state))) + return; + if (BNXT_PF(bp)) queue_delayed_work(bnxt_pf_wq, &bp->fw_reset_task, delay); else @@ -1159,10 +1162,12 @@ static void bnxt_queue_sp_work(struct bnxt *bp) static void bnxt_cancel_sp_work(struct bnxt *bp) { - if (BNXT_PF(bp)) + if (BNXT_PF(bp)) { flush_workqueue(bnxt_pf_wq); - else + } else { cancel_work_sync(&bp->sp_task); + cancel_delayed_work_sync(&bp->fw_reset_task); + } } static void bnxt_sched_reset(struct bnxt *bp, struct bnxt_rx_ring_info *rxr) @@ -11386,6 +11391,7 @@ static void bnxt_remove_one(struct pci_dev *pdev) unregister_netdev(dev); bnxt_dl_unregister(bp); bnxt_shutdown_tc(bp); + clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state); bnxt_cancel_sp_work(bp); bp->sp_event = 0; -- 2.25.1