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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3848BC433EF for ; Mon, 30 May 2022 14:39:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239966AbiE3OjX (ORCPT ); Mon, 30 May 2022 10:39:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242239AbiE3OSn (ORCPT ); Mon, 30 May 2022 10:18:43 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C23F11E1E4; Mon, 30 May 2022 06:49:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 43068B80DB3; Mon, 30 May 2022 13:49:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48ABBC3411A; Mon, 30 May 2022 13:49:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1653918570; bh=+hGjQKfDNGnTsMzTo9PMesAjDFTq1kh+tT1+3aPgf3c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i0Zqa7AHJs0ltPu/4nGxGI09QyNLML30FHOWmz+23LEljNKFqcR9AYhpFb/oI/saz vPNxPW7ycR70is5h3kbXj01DroQJuTqVHVHvTtaWbsTMub5KwxN7OnDbqsnwyWbOoH R9Gq+sRa8QSoKnd1z9sMkm29wfZH2+1cwjayzDhbBn5Cg0dOzMOz9m0md/LfABb1Ho b2ZEHkyF7O71a01pn681ebProYzG0I9E0r5jTxKr0l5TmqfS6zuj3+P/DzXUmHf/wX B9EDV6rNCqn0a1iFGnQBWyR99ytP+SuZpVaC8sbhldhZsO1aaVJjvtBQgKr3y6tJ+i QKYv8CuzzJBrg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Niels Dossche , Brian Norris , Kalle Valo , Sasha Levin , amitkarwar@gmail.com, ganapathi017@gmail.com, sharvari.harisangam@nxp.com, huxinming820@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 02/38] mwifiex: add mutex lock for call in mwifiex_dfs_chan_sw_work_queue Date: Mon, 30 May 2022 09:48:48 -0400 Message-Id: <20220530134924.1936816-2-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220530134924.1936816-1-sashal@kernel.org> References: <20220530134924.1936816-1-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-kernel@vger.kernel.org From: Niels Dossche [ Upstream commit 3e12968f6d12a34b540c39cbd696a760cc4616f0 ] cfg80211_ch_switch_notify uses ASSERT_WDEV_LOCK to assert that net_device->ieee80211_ptr->mtx (which is the same as priv->wdev.mtx) is held during the function's execution. mwifiex_dfs_chan_sw_work_queue is one of its callers, which does not hold that lock, therefore violating the assertion. Add a lock around the call. Disclaimer: I am currently working on a static analyser to detect missing locks. This was a reported case. I manually verified the report by looking at the code, so that I do not send wrong information or patches. After concluding that this seems to be a true positive, I created this patch. However, as I do not in fact have this particular hardware, I was unable to test it. Reviewed-by: Brian Norris Signed-off-by: Niels Dossche Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220321225515.32113-1-dossche.niels@gmail.com Signed-off-by: Sasha Levin --- drivers/net/wireless/marvell/mwifiex/11h.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/11h.c b/drivers/net/wireless/marvell/mwifiex/11h.c index 238accfe4f41..c4176e357b22 100644 --- a/drivers/net/wireless/marvell/mwifiex/11h.c +++ b/drivers/net/wireless/marvell/mwifiex/11h.c @@ -303,5 +303,7 @@ void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work) mwifiex_dbg(priv->adapter, MSG, "indicating channel switch completion to kernel\n"); + mutex_lock(&priv->wdev.mtx); cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef); + mutex_unlock(&priv->wdev.mtx); } -- 2.35.1