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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 06E4FC388F7 for ; Tue, 10 Nov 2020 03:56:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ACD5A204EA for ; Tue, 10 Nov 2020 03:56:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ETRTiFbJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387714AbgKJD4q (ORCPT ); Mon, 9 Nov 2020 22:56:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:58860 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730249AbgKJD4o (ORCPT ); Mon, 9 Nov 2020 22:56:44 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0182E2063A; Tue, 10 Nov 2020 03:56:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604980603; bh=7y1FuVyjxr2ugCCeDo7vnYcqlQj71agm0WBc/48hLCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ETRTiFbJPEYgQ7ezUVT9/FJ3lghQXH6t9ADaI7jxmcksizqGBLKGNA42rb+uDP7hq bVNkc+a1qknHRUykbwjhDo9SYKOn2/CDJ/YnLaF4znNIU5WLL1J0z/1jAJsh9TDYbR u7S7TeW0hLo9ZNXqqRNM4c5ZJXYlaGO0xv+Tx6Ug= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Johannes Berg , syzbot+2e293dbd67de2836ba42@syzkaller.appspotmail.com, Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 07/12] mac80211: always wind down STA state Date: Mon, 9 Nov 2020 22:56:28 -0500 Message-Id: <20201110035633.425030-7-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201110035633.425030-1-sashal@kernel.org> References: <20201110035633.425030-1-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-wireless@vger.kernel.org From: Johannes Berg [ Upstream commit dcd479e10a0510522a5d88b29b8f79ea3467d501 ] When (for example) an IBSS station is pre-moved to AUTHORIZED before it's inserted, and then the insertion fails, we don't clean up the fast RX/TX states that might already have been created, since we don't go through all the state transitions again on the way down. Do that, if it hasn't been done already, when the station is freed. I considered only freeing the fast TX/RX state there, but we might add more state so it's more robust to wind down the state properly. Note that we warn if the station was ever inserted, it should have been properly cleaned up in that case, and the driver will probably not like things happening out of order. Reported-by: syzbot+2e293dbd67de2836ba42@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20201009141710.7223b322a955.I95bd08b9ad0e039c034927cce0b75beea38e059b@changeid Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/sta_info.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index fef8d7758dae9..8a9bbcfefbca6 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -243,6 +243,24 @@ struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, */ void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) { + /* + * If we had used sta_info_pre_move_state() then we might not + * have gone through the state transitions down again, so do + * it here now (and warn if it's inserted). + * + * This will clear state such as fast TX/RX that may have been + * allocated during state transitions. + */ + while (sta->sta_state > IEEE80211_STA_NONE) { + int ret; + + WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED)); + + ret = sta_info_move_state(sta, sta->sta_state - 1); + if (WARN_ONCE(ret, "sta_info_move_state() returned %d\n", ret)) + break; + } + if (sta->rate_ctrl) rate_control_free_sta(sta); -- 2.27.0