From patchwork Wed Sep 28 22:49:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Prestwood X-Patchwork-Id: 610548 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 76E41C32771 for ; Wed, 28 Sep 2022 22:49:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234109AbiI1WtR (ORCPT ); Wed, 28 Sep 2022 18:49:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229901AbiI1WtP (ORCPT ); Wed, 28 Sep 2022 18:49:15 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ADDC21114F6 for ; Wed, 28 Sep 2022 15:49:14 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id r8-20020a17090a560800b00205eaaba073so2884297pjf.1 for ; Wed, 28 Sep 2022 15:49:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date; bh=EO1SU1X2FUBsNtFwmlpCnKck5Lg/0kTWiFSbiQDbQB8=; b=NihL1qOcRdAax6ULgQoRKIllcORIg7yrFvHYEtyiUkZatT4WeSdI1XfPmoylDoJ1bH SqdpsdihA9saSvAeQn2C4e85rlN5+6IGQGY4/6Q6/tYIZEdNDZXLyoj4c3eVuxQIEKsO oRliHiGWH35ufYd1/TwmHfs6baDWGHMFI+pOdsCs9YzMRiut29AY4zSRfmhOHoLXYZwu b0F7nsmKj7a4zM8AiYk7Zfb1VAt6a3qHA2L/GYRTLvRtV3R6Xgqe5fDj+qVpHlImAJ5q 5ydUXKRr+680zs8AS5asVl5NksKMoK8+aOh/uq56tXV0K54kTzomJAjf711NXeAirTgP escA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date; bh=EO1SU1X2FUBsNtFwmlpCnKck5Lg/0kTWiFSbiQDbQB8=; b=wLJv5tzqhcXuhRJ+M3krJqQFEvMMRSor03DpAs6s6uTGh1jf0rJhKYZj++cdMHgimq goCnm5/+2nNKFOlKoKflrIRblzzjl11zZt0XMx79BFimNEuInylw/mFfq9omFpmSR/fN w11qmmiEKY1MhHujicjFlvT3k5/6Bu0UZefCpuxlRz6sxKHtRoLP/y3jfUmQ377xsNNq x4j01x81lq0bA6nIfFZ2xxxh5xQBn50N528MYEAUZ0kntCZfR+xdZO1pp2J1n3hxcz3u DDbRS7oMcE55WXrx7AEswzeyu6HUYDfrjOgUWKuDDj/dEjCpIfiP/d+s8hFmEcmICnMD bz+Q== X-Gm-Message-State: ACrzQf39WUi3Nkmb2FXbNH5dHaDEafr6416dMSxDKQHuOfvW8zP0Zh8e QkAy+Ykzo7C5pAsihOHV33cblPrjD5U= X-Google-Smtp-Source: AMsMyM43V9NUSod2OtBGTTumTJqHoSGkIZe4sLVGf3luThC9BtPO9bo4KNc545sA3XpdDxj8qHxIJQ== X-Received: by 2002:a17:902:d50b:b0:178:3ea4:2945 with SMTP id b11-20020a170902d50b00b001783ea42945mr195810plg.67.1664405353816; Wed, 28 Sep 2022 15:49:13 -0700 (PDT) Received: from jprestwo-xps.none ([50.54.173.139]) by smtp.gmail.com with ESMTPSA id ob6-20020a17090b390600b001f2fa09786asm643738pjb.19.2022.09.28.15.49.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Sep 2022 15:49:13 -0700 (PDT) From: James Prestwood To: linux-wireless@vger.kernel.org Cc: James Prestwood Subject: [PATCH 0/1] Fix potential HE IE bug and some other questions Date: Wed, 28 Sep 2022 15:49:09 -0700 Message-Id: <20220928224910.453232-1-prestwoj@gmail.com> X-Mailer: git-send-email 2.34.3 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org I believe there is a bug when building the probe request IEs for the HE capabilities. More info in the patch. While looking at this I noticed some other confusing code related to building the probe request. Looking at ieee80211_build_preq_ies. It is passed 'bands_used' which is a bitmask of bands. A probe request is only sent out on a single band so why would this contain multiple bands? We then loop over these bands and call ieee80211_build_preq_ies_band for each one. This, AFAICT, would append the same IEs multiple times if 'bands_used' contained more than one band. Internal to mac80211/util.c its only passed BIT(chan->band), but mac80211/scan.c seems to pass a list... Below is the warning I am seeing (many, many times). It says the warning is in build_preq_ies, but it really seems like this is not correct and its actually in ieee80211_get_he_6ghz_capa since I see no warning message as others _should_ have. [ 732.130000] ------------[ cut here ]------------ [ 732.130000] WARNING: CPU: 0 PID: 1352 at include/net/cfg80211.h:608 ieee80211_build_preq_ies+0x766/0x84d [ 732.130000] Modules linked in: [ 732.130000] CPU: 0 PID: 1352 Comm: kworker/u2:0 Tainted: G W 5.19.0 #1 [ 732.130000] Workqueue: rad6 ieee80211_scan_work [ 732.130000] Stack: [ 732.130000] 605d0943 60256c96 60035421 00000001 [ 732.130000] 6052cddd 60450efa 61f3d5d9 60454c00 [ 732.130000] 00000000 00000000 00000009 6003e77d [ 732.130000] Call Trace: [ 732.130000] [<60256c96>] ? dump_stack_print_info+0xe1/0xef [ 732.130000] [<60035421>] ? um_set_signals+0x0/0x3c [ 732.130000] [<60450efa>] ? _printk+0x0/0x9f [ 732.130000] [<60454c00>] ? dump_stack_lvl+0x47/0x52 [ 732.130000] [<6003e77d>] ? __warn+0xf2/0x123 [ 732.130000] [<60035449>] ? um_set_signals+0x28/0x3c [ 732.130000] [<604501bb>] ? warn_slowpath_fmt+0xd6/0xe2 [ 732.130000] [<6042830f>] ? ieee80211_prepare_and_rx_handle+0xbf4/0xc22 [ 732.130000] [<604500e5>] ? warn_slowpath_fmt+0x0/0xe2 [ 732.130000] [<603d3bc5>] ? ieee80211_ie_split_ric+0xe4/0xfe [ 732.130000] [<60035421>] ? um_set_signals+0x0/0x3c [ 732.130000] [<604341ac>] ? ieee80211_vif_type_p2p+0x0/0x26 [ 732.130000] [<6043aeb5>] ? ieee80211_build_preq_ies+0x766/0x84d [ 732.130000] [<60035377>] ? unblock_signals+0x36/0xe0 [ 732.130000] [<60429f6c>] ? skb_put_zero+0x2c/0x34 [ 732.130000] [<60429f40>] ? skb_put_zero+0x0/0x34 [ 732.130000] [<6043b095>] ? ieee80211_build_probe_req+0xf9/0x161 [ 732.130000] [<6040c2ed>] ? ieee80211_scan_state_send_probe+0xaf/0x14c [ 732.130000] [<60051181>] ? queue_delayed_work_on+0x67/0x72 [ 732.130000] [<6040d1b0>] ? ieee80211_scan_work+0x40b/0x503 [ 732.130000] [<6040cda5>] ? ieee80211_scan_work+0x0/0x503 [ 732.130000] [<600529de>] ? process_one_work+0x1b0/0x2b1 [ 732.130000] [<6004f829>] ? move_linked_works+0x0/0x57 [ 732.130000] [<60053086>] ? worker_thread+0x270/0x39b [ 732.130000] [<6004f909>] ? set_pf_worker+0x0/0x5f [ 732.130000] [<60057231>] ? arch_local_irq_save+0x0/0x26 [ 732.130000] [<60035449>] ? um_set_signals+0x28/0x3c [ 732.130000] [<60052e16>] ? worker_thread+0x0/0x39b [ 732.130000] [<600588ef>] ? kthread_exit+0x0/0x37 [ 732.130000] [<60052e16>] ? worker_thread+0x0/0x39b [ 732.130000] [<60058a6d>] ? kthread+0x11f/0x124 [ 732.130000] [<60035377>] ? unblock_signals+0x36/0xe0 [ 732.130000] [<60021f95>] ? new_thread_handler+0x86/0xbb [ 732.130000] ---[ end trace 0000000000000000 ]--- [ 732.210000] ------------[ cut here ]------------ James Prestwood (1): wifi: mac80211: fix probe req HE capabilities access net/mac80211/util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)