From patchwork Mon May 16 19:36:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 573395 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 92BF2C4332F for ; Mon, 16 May 2022 19:44:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233004AbiEPTn6 (ORCPT ); Mon, 16 May 2022 15:43:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346083AbiEPTmu (ORCPT ); Mon, 16 May 2022 15:42:50 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E34853F32B; Mon, 16 May 2022 12:41:20 -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 197F561512; Mon, 16 May 2022 19:41:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17105C385AA; Mon, 16 May 2022 19:41:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730079; bh=jXsRJZlhkkVNE5KFJ6uMHiXK5LPb7EkwA2pg9EW8UoA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jeIF6155DwepFbd8POLDNrVPixbVbwQo4llPFQD0tlC3sp5+sOa+xJGgNC8PjXaRx ftF29XpFT3739QteWs+ctzPAbizNeFwVO6/Xc+Fr9hzURQSghZ1HCmxZIq1jyUnFvC jFSGmDcej8qYjzFbJggU6almYzGwDOoiAKzf62LQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johannes Berg , Sasha Levin Subject: [PATCH 4.19 06/32] mac80211_hwsim: call ieee80211_tx_prepare_skb under RCU protection Date: Mon, 16 May 2022 21:36:20 +0200 Message-Id: <20220516193614.966264764@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193614.773450018@linuxfoundation.org> References: <20220516193614.773450018@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 c84ee5ba5381..3d8e17bb8a10 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -2082,11 +2082,13 @@ 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; } @@ -2094,6 +2096,7 @@ 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(); } }