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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 5AD4EC2B9F4 for ; Mon, 28 Jun 2021 15:00:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4655A613EF for ; Mon, 28 Jun 2021 15:00:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236611AbhF1PDD (ORCPT ); Mon, 28 Jun 2021 11:03:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:51700 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236091AbhF1OqO (ORCPT ); Mon, 28 Jun 2021 10:46:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id F099061C9D; Mon, 28 Jun 2021 14:34:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624890867; bh=43SXdYKsUYP0iubQxO3wUEuEytT/p9gIInXcZBh2L5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BFHiABmp7oVw7y58TmDmU2+LqFfcSIEJUrB9jvbB1S4hFg4WXttODWSP+MJE3bxzj 7/m3wo2lJeI6nlRoT02A9e4K7zmxa/kkPifAdkyhRF4cCV1Cun+woz/ttWjuR3cgrr RJNpRe+bxxdn5y7YvfMgBWAO9U1nSsTNLjqAusqk8Fon2ydK+KtFjICR2K5lz+C7eL LnLSNuP9gVX+p3pM3KdqKA3IQBm6UarhVYSFt/EHcLbC2axl843fbmyfiZJdurh6se UWWqFAKyzzS7wB0+jajAZHpNPJoT4G+w6Z26hKaP79tqcYP3ZhXucqpfSGgwUyEtIt gSiA9pKU+D7tw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Du Cheng , syzbot+105896fac213f26056f9@syzkaller.appspotmail.com, Johannes Berg , Sasha Levin Subject: [PATCH 4.19 091/109] cfg80211: call cfg80211_leave_ocb when switching away from OCB Date: Mon, 28 Jun 2021 10:32:47 -0400 Message-Id: <20210628143305.32978-92-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210628143305.32978-1-sashal@kernel.org> References: <20210628143305.32978-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.19.196-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-4.19.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 4.19.196-rc1 X-KernelTest-Deadline: 2021-06-30T14:32+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Du Cheng [ Upstream commit a64b6a25dd9f984ed05fade603a00e2eae787d2f ] If the userland switches back-and-forth between NL80211_IFTYPE_OCB and NL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), there is a chance where the cleanup cfg80211_leave_ocb() is not called. This leads to initialization of in-use memory (e.g. init u.ibss while in-use by u.ocb) due to a shared struct/union within ieee80211_sub_if_data: struct ieee80211_sub_if_data { ... union { struct ieee80211_if_ap ap; struct ieee80211_if_vlan vlan; struct ieee80211_if_managed mgd; struct ieee80211_if_ibss ibss; // <- shares address struct ieee80211_if_mesh mesh; struct ieee80211_if_ocb ocb; // <- shares address struct ieee80211_if_mntr mntr; struct ieee80211_if_nan nan; } u; ... } Therefore add handling of otype == NL80211_IFTYPE_OCB, during cfg80211_change_iface() to perform cleanup when leaving OCB mode. link to syzkaller bug: https://syzkaller.appspot.com/bug?id=0612dbfa595bf4b9b680ff7b4948257b8e3732d5 Reported-by: syzbot+105896fac213f26056f9@syzkaller.appspotmail.com Signed-off-by: Du Cheng Link: https://lore.kernel.org/r/20210428063941.105161-1-ducheng2@gmail.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/wireless/util.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/wireless/util.c b/net/wireless/util.c index c4536468dfbe..e7be500b6452 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -965,6 +965,9 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev, case NL80211_IFTYPE_MESH_POINT: /* mesh should be handled? */ break; + case NL80211_IFTYPE_OCB: + cfg80211_leave_ocb(rdev, dev); + break; default: break; } -- 2.30.2