From patchwork Mon May 16 19:35:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573730 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 6166BC43217 for ; Mon, 16 May 2022 20:08:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235607AbiEPUIG (ORCPT ); Mon, 16 May 2022 16:08:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349930AbiEPUAf (ORCPT ); Mon, 16 May 2022 16:00:35 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DEF904551D; Mon, 16 May 2022 12:54:43 -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 dfw.source.kernel.org (Postfix) with ESMTPS id D2C8D60ABE; Mon, 16 May 2022 19:54:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DEC63C385AA; Mon, 16 May 2022 19:54:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730852; bh=ize+Z2p1919wg9IWVHSx8lwSDKILqvYJ8heBHS0qlLo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p3lvg7a+9e2yBVT7rvKqgh6o9rNjTdj0JLSJH+hoq/d+qTtMU312bEcu85FDEoJg9 kRgFOh62dkXZ1I5ZrtSmbw+xBEpSj2XHN2/4KcRjPiTdTS+aOBN0G9OZJHczQZZaLU 84H/E415VoFqpkfB9W0ITn8c/8rNzZaIAa/Lvqos= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johannes Berg , Sasha Levin Subject: [PATCH 5.17 025/114] mac80211_hwsim: call ieee80211_tx_prepare_skb under RCU protection Date: Mon, 16 May 2022 21:35:59 +0200 Message-Id: <20220516193626.215203515@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193625.489108457@linuxfoundation.org> References: <20220516193625.489108457@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johannes Berg [ Upstream commit 9e2db50f1ef2238fc2f71c5de1c0418b7a5b0ea2 ] This is needed since it might use (and pass out) pointers to e.g. keys protected by RCU. Can't really happen here as the frames aren't encrypted, but we need to still adhere to the rules. Fixes: cacfddf82baf ("mac80211_hwsim: initialize ieee80211_tx_info at hw_scan_work") Signed-off-by: Johannes Berg Link: https://lore.kernel.org/r/20220505230421.5f139f9de173.I77ae111a28f7c0e9fd1ebcee7f39dbec5c606770@changeid Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- drivers/net/wireless/mac80211_hwsim.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index fc5725f6daee..4a91d5cb75c3 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -2336,11 +2336,13 @@ static void hw_scan_work(struct work_struct *work) if (req->ie_len) skb_put_data(probe, req->ie, req->ie_len); + rcu_read_lock(); if (!ieee80211_tx_prepare_skb(hwsim->hw, hwsim->hw_scan_vif, probe, hwsim->tmp_chan->band, NULL)) { + rcu_read_unlock(); kfree_skb(probe); continue; } @@ -2348,6 +2350,7 @@ static void hw_scan_work(struct work_struct *work) local_bh_disable(); mac80211_hwsim_tx_frame(hwsim->hw, probe, hwsim->tmp_chan); + rcu_read_unlock(); local_bh_enable(); } }