From patchwork Mon Aug 30 07:32:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ping-Ke Shih X-Patchwork-Id: 504534 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, 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 48381C432BE for ; Mon, 30 Aug 2021 07:33:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E6706056B for ; Mon, 30 Aug 2021 07:33:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233901AbhH3Heh (ORCPT ); Mon, 30 Aug 2021 03:34:37 -0400 Received: from rtits2.realtek.com ([211.75.126.72]:47698 "EHLO rtits2.realtek.com.tw" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232321AbhH3Heg (ORCPT ); Mon, 30 Aug 2021 03:34:36 -0400 Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.73 with qID 17U7XXsG4007809, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36503.realtek.com.tw[172.21.6.25]) by rtits2.realtek.com.tw (8.15.2/2.71/5.88) with ESMTPS id 17U7XXsG4007809 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Mon, 30 Aug 2021 15:33:33 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36503.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.14; Mon, 30 Aug 2021 15:33:32 +0800 Received: from localhost (172.21.69.146) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2106.2; Mon, 30 Aug 2021 15:33:32 +0800 From: Ping-Ke Shih To: CC: , , , Subject: [PATCH v3] mac80211: Fix ieee80211_amsdu_aggregate frag_tail bug Date: Mon, 30 Aug 2021 15:32:40 +0800 Message-ID: <20210830073240.12736-1-pkshih@realtek.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [172.21.69.146] X-ClientProxiedBy: RTEXMBS02.realtek.com.tw (172.21.6.95) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: trusted connection X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 08/30/2021 07:07:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: =?big5?b?Q2xlYW4sIGJhc2VzOiAyMDIxLzgvMzAgpFekyCAw?= =?big5?b?NDoyMTowMA==?= X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-ServerInfo: RTEXH36503.realtek.com.tw, 9 X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-AntiSpam-Outbound-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 08/30/2021 07:14:53 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 0 X-KSE-AntiSpam-Info: Lua profiles 165837 [Aug 30 2021] X-KSE-AntiSpam-Info: Version: 5.9.20.0 X-KSE-AntiSpam-Info: Envelope from: pkshih@realtek.com X-KSE-AntiSpam-Info: LuaCore: 457 457 f9912fc467375383fbac52a53ade5bbe1c769e2a X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: 127.0.0.199:7.1.2; d41d8cd98f00b204e9800998ecf8427e.com:7.1.1; realtek.com:7.1.1 X-KSE-AntiSpam-Info: Rate: 0 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 08/30/2021 07:18:00 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Chih-Kang Chang In ieee80211_amsdu_aggregate() set a pointer frag_tail point to the end of skb_shinfo(head)->frag_list, and use it to bind other skb in the end of this function. But when execute ieee80211_amsdu_aggregate() ->ieee80211_amsdu_realloc_pad()->pskb_expand_head(), the address of skb_shinfo(head)->frag_list will be changed. However, the ieee80211_amsdu_aggregate() not update frag_tail after call pskb_expand_head(). That will cause the second skb can't bind to the head skb appropriately.So we update the address of frag_tail to fix it. Fixes: 6e0456b54545 ("mac80211: add A-MSDU tx support") Signed-off-by: Chih-Kang Chang Signed-off-by: Zong-Zhe Yang Signed-off-by: Ping-Ke Shih --- v3: fix coding style of comment indentation. v2: an alternative fix to prevent iterating fragment twice. --- net/mac80211/tx.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 2d1193ed3eb5..63ae6c044cf5 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3380,6 +3380,13 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) goto out; + /* While n == 2, frag_tail should be the address of head's frag_list. + * However, head probably re-alloc after ieee80211_amsdu_prepare_head. + * So, re-assign frag_tail again to make sure the correctness. + */ + if (n == 2) + frag_tail = &skb_shinfo(head)->frag_list; + /* * Pad out the previous subframe to a multiple of 4 by adding the * padding to the next one, that's being added. Note that head->len