From patchwork Fri Nov 4 11:08:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: shaozhengchao X-Patchwork-Id: 13031636 X-Patchwork-Delegate: kuba@kernel.org 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 B0556C433FE for ; Fri, 4 Nov 2022 11:02:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231464AbiKDLCU (ORCPT ); Fri, 4 Nov 2022 07:02:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231665AbiKDLBu (ORCPT ); Fri, 4 Nov 2022 07:01:50 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0BDC2CC98; Fri, 4 Nov 2022 04:01:48 -0700 (PDT) Received: from dggpeml500026.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4N3d3n0z11z15MJP; Fri, 4 Nov 2022 19:01:41 +0800 (CST) Received: from huawei.com (10.175.101.6) by dggpeml500026.china.huawei.com (7.185.36.106) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 4 Nov 2022 19:01:46 +0800 From: Zhengchao Shao To: , , , , , , CC: , , Subject: [PATCH net] wifi: mac80211: fix WARNING in ieee80211_link_info_change_notify() Date: Fri, 4 Nov 2022 19:08:56 +0800 Message-ID: <20221104110856.364410-1-shaozhengchao@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpeml500026.china.huawei.com (7.185.36.106) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Syz reports the following WARNING: wlan0: Failed check-sdata-in-driver check, flags: 0x0 WARNING: CPU: 3 PID: 5384 at net/mac80211/main.c:287 ieee80211_link_info_change_notify+0x1c2/0x230 Modules linked in: RIP: 0010:ieee80211_link_info_change_notify+0x1c2/0x230 Call Trace: ieee80211_set_mcast_rate+0x3e/0x50 nl80211_set_mcast_rate+0x316/0x650 genl_family_rcv_msg_doit+0x20b/0x300 genl_rcv_msg+0x39f/0x6a0 netlink_rcv_skb+0x13b/0x3b0 genl_rcv+0x24/0x40 netlink_unicast+0x4a2/0x740 netlink_sendmsg+0x83e/0xce0 sock_sendmsg+0xc5/0x100 ____sys_sendmsg+0x583/0x690 ___sys_sendmsg+0xe8/0x160 __sys_sendmsg+0xbf/0x160 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The execution process is as follows: Thread A: ieee80211_open() ieee80211_do_open() drv_add_interface() //set IEEE80211_SDATA_IN_DRIVER flag ... cfg80211_shutdown_all_interfaces() ... ieee80211_stop() ieee80211_do_stop() drv_remove_interface() //clear flag ... nl80211_set_mcast_rate() ieee80211_set_mcast_rate() ieee80211_link_info_change_notify() check_sdata_in_driver() //WARNING because flag is cleared When the wlan device stops, the IEEE80211_SDATA_IN_ DRIVER flag is cleared after the interface is removed. And then after the set mcast rate command is executed, a WARNING is generated because the flag bit is cleared. Fixes: 591e73ee3f73 ("wifi: mac80211: properly skip link info driver update") Reported-by: syzbot+bce2ca140cc00578ed07@syzkaller.appspotmail.com Signed-off-by: Zhengchao Shao --- net/mac80211/main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 46f3eddc2388..8a727b532f77 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -284,6 +284,9 @@ void ieee80211_link_info_change_notify(struct ieee80211_sub_if_data *sdata, if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN) return; + if (!ieee80211_sdata_running(sdata)) + return; + if (!check_sdata_in_driver(sdata)) return;