Received: by 2002:a05:6a10:9848:0:0:0:0 with SMTP id x8csp1305387pxf; Fri, 12 Mar 2021 06:51:37 -0800 (PST) X-Google-Smtp-Source: ABdhPJzV2539Gwzymftc5Yx8uoDGvzej8wP0Q4XlcpPe/A5fC65m+sNigp3McIt06UJe4cKnaQCC X-Received: by 2002:aa7:d0c2:: with SMTP id u2mr14480162edo.158.1615560697294; Fri, 12 Mar 2021 06:51:37 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1615560697; cv=none; d=google.com; s=arc-20160816; b=Jz3vmfS9zhv2X7wdn630I3bM1N6vLjrO2fNM5Ud43PuUSuuJ+9Ex9DRPMu9TT9WC1o 3h+Btm5Je+O9JZ2TybNrbEyVC1BHd+Fr/qfS/EduzCFfqfWqjevar0xNr8xwugMN3UOR LWoR2fxesjMLorYWHlI4ZuRgXsGVQcDfp06GbD0UiPPt0DBJXjalNRNolj+4qew+m0UZ ZAqQlP4kzyCCGFQREedTP/P8Zp37gQkR9/t+jN0HWae0+axSf7k4dHG/8zrJHt0eq7bd ySLVALhwsc13jtPwiuulfDP+UIYlQi4OAC5QRUKnZTCAPomxlzw15OgsrNedxtBeJnQ7 9s4g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:message-id:mime-version :content-transfer-encoding:references:in-reply-to:subject:cc:to:from :date:dkim-signature; bh=lmbb4T7NeOjVMhhQ3m0JP1s/BJJvieFAt0EpnCJEEEk=; b=LzNX6/Ctn6f3RN9TPFcUVVARRkWJVcqxeKMhdzdGiCehiHCJvy8Ii48AG+ELIofpP5 EBWKmLzsvfW1c1QD4ni7J6V29M2Lsi8A98eyjHtO5PjZUj3Q7MrPKpQCXkZrYtvvwfGq UC75r0Vsv/gTnYib/POMNK/WIpomfZHTJ1tCM9nQoMSPGNPYRyQ1soEsIRSan5QHzUIm eMB4SMpv6phcXpCXAYeAFdauAiqTKfvppO00AlJAOxN0jLtwSqWeLrM7ynAVYsg5u3Vy SOaDzOJRJAWDxx4kWU5bj3PaRHrfdnk3FEzH6S3YyRgejWXuMJmnM7hyNQ7V4fYROWJw lw4A== ARC-Authentication-Results: i=1; mx.google.com; dkim=neutral (body hash did not verify) header.i=@mail.ustc.edu.cn header.s=dkim header.b=vkd8x3CP; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=mail.ustc.edu.cn Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id p31si4404025edb.298.2021.03.12.06.51.14; Fri, 12 Mar 2021 06:51:37 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@mail.ustc.edu.cn header.s=dkim header.b=vkd8x3CP; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=mail.ustc.edu.cn Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231727AbhCLOs0 (ORCPT + 99 others); Fri, 12 Mar 2021 09:48:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34934 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231730AbhCLOsV (ORCPT ); Fri, 12 Mar 2021 09:48:21 -0500 Received: from ustc.edu.cn (email6.ustc.edu.cn [IPv6:2001:da8:d800::8]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 10DDAC061574; Fri, 12 Mar 2021 06:48:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mail.ustc.edu.cn; s=dkim; h=Received:Date:From:To:Cc:Subject: In-Reply-To:References:Content-Transfer-Encoding:Content-Type: MIME-Version:Message-ID; bh=eNe3lMdiYSlKSx8VAknAbgTJQAiODgr25WWb vEVvKw8=; b=vkd8x3CPwQqjbSXY7DrdPHrJ/u/bevx/DjhcTz2DIjOi/l7PcaiK 14bsSV96+2nPgBytfc6g0dfksZJyi149ANM4bHe6JFTPq8IYvYAHLEPA46bIm1MZ ret2tV0E7+NTrAJOhwcfj4VDtgenVGLpCkIgb7cLqxlWh3ngh2xPjks= Received: by ajax-webmail-newmailweb.ustc.edu.cn (Coremail) ; Fri, 12 Mar 2021 22:47:53 +0800 (GMT+08:00) X-Originating-IP: [114.214.251.230] Date: Fri, 12 Mar 2021 22:47:53 +0800 (GMT+08:00) X-CM-HeaderCharset: UTF-8 From: lyl2019@mail.ustc.edu.cn To: "Tom Parkin" Cc: paulus@samba.org, davem@davemloft.net, linux-ppp@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Re: [BUG] net/ppp: A use after free in ppp_unregister_channe X-Priority: 3 X-Mailer: Coremail Webmail Server Version XT3.0.8 dev build 20190610(cb3344cf) Copyright (c) 2002-2021 www.mailtech.cn ustc-xl In-Reply-To: <20210312101258.GA4951@katalix.com> References: <6057386d.ca12.1782148389e.Coremail.lyl2019@mail.ustc.edu.cn> <20210312101258.GA4951@katalix.com> X-SendMailWithSms: false Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=UTF-8 MIME-Version: 1.0 Message-ID: <2ad7aaa2.fcad.17826e87afb.Coremail.lyl2019@mail.ustc.edu.cn> X-Coremail-Locale: zh_CN X-CM-TRANSID: LkAmygBXXDwZf0tg0AcVAA--.2W X-CM-SenderInfo: ho1ojiyrz6zt1loo32lwfovvfxof0/1tbiAQoSBlQhn5CimQABsf X-Coremail-Antispam: 1Ur529EdanIXcx71UUUUU7IcSsGvfJ3iIAIbVAYjsxI4VWxJw CS07vEb4IE77IF4wCS07vE1I0E4x80FVAKz4kxMIAIbVAFxVCaYxvI4VCIwcAKzIAtYxBI daVFxhVjvjDU= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCg0KPiAtLS0tLeWOn+Wni+mCruS7ti0tLS0tDQo+IOWPkeS7tuS6ujogIlRvbSBQYXJraW4i IDx0cGFya2luQGthdGFsaXguY29tPg0KPiDlj5HpgIHml7bpl7Q6IDIwMjEtMDMtMTIgMTg6MTI6 NTggKOaYn+acn+S6lCkNCj4g5pS25Lu25Lq6OiBseWwyMDE5QG1haWwudXN0Yy5lZHUuY24NCj4g 5oqE6YCBOiBwYXVsdXNAc2FtYmEub3JnLCBkYXZlbUBkYXZlbWxvZnQubmV0LCBsaW51eC1wcHBA dmdlci5rZXJuZWwub3JnLCBuZXRkZXZAdmdlci5rZXJuZWwub3JnLCBsaW51eC1rZXJuZWxAdmdl ci5rZXJuZWwub3JnDQo+IOS4u+mimDogUmU6IFtCVUddIG5ldC9wcHA6IEEgdXNlIGFmdGVyIGZy ZWUgaW4gcHBwX3VucmVnaXN0ZXJfY2hhbm5lDQo+IA0KPiBUaGFua3MgZm9yIHRoZSByZXBvcnQh DQo+IA0KPiBPbiAgVGh1LCBNYXIgMTEsIDIwMjEgYXQgMjA6MzQ6NDQgKzA4MDAsIGx5bDIwMTlA bWFpbC51c3RjLmVkdS5jbiB3cm90ZToNCj4gPiBGaWxlOiBkcml2ZXJzL25ldC9wcHAvcHBwX2dl bmVyaWMuYw0KPiA+IA0KPiA+IEluIHBwcF91bnJlZ2lzdGVyX2NoYW5uZWwsIHBjaCBjb3VsZCBi ZSBmcmVlZCBpbiBwcHBfdW5icmlkZ2VfY2hhbm5lbHMoKQ0KPiA+IGJ1dCBhZnRlciB0aGF0IHBj aCBpcyBzdGlsbCBpbiB1c2UuIEluc2lkZSB0aGUgZnVuY3Rpb24gcHBwX3VuYnJpZGdlX2NoYW5u ZWxzLA0KPiA+IGlmICJwY2hiYiA9PSBwY2giIGlzIHRydWUgYW5kIHRoZW4gcGNoIHdpbGwgYmUg ZnJlZWQuDQo+IA0KPiBEbyB5b3UgaGF2ZSBhIHdheSB0byByZXByb2R1Y2UgYSB1c2UtYWZ0ZXIt ZnJlZSBzY2VuYXJpbz8NCj4gDQo+IEZyb20gc3RhdGljIGFuYWx5c2lzIEknbSBub3Qgc3VyZSBo b3cgcGNoIHdvdWxkIGJlIGZyZWVkIGluDQo+IHBwcF91bmJyaWRnZV9jaGFubmVscyB3aGVuIGNh bGxlZCB2aWEuIHBwcF91bnJlZ2lzdGVyX2NoYW5uZWwuDQo+IA0KPiBJbiB0aGVvcnkgKGF0IGxl YXN0ISkgdGhlIGNhbGxlciBvZiBwcHBfcmVnaXN0ZXJfbmV0X2NoYW5uZWwgaG9sZHMgDQo+IGEg cmVmZXJlbmNlIG9uIHN0cnVjdCBjaGFubmVsIHdoaWNoIHBwcF91bnJlZ2lzdGVyX2NoYW5uZWwg ZHJvcHMuDQo+IA0KPiBFYWNoIGNoYW5uZWwgaW4gYSBicmlkZ2VkIHBhaXIgaG9sZHMgYSByZWZl cmVuY2Ugb24gdGhlIG90aGVyLg0KPiANCj4gSGVuY2Ugb24gcmV0dXJuIGZyb20gcHBwX3VuYnJp ZGdlX2NoYW5uZWxzLCB0aGUgY2hhbm5lbCBzaG91bGQgbm90IGhhdmUNCj4gYmVlbiBmcmVlZCAo aW4gdGhpcyBjb2RlIHBhdGgpIGJlY2F1c2UgdGhlIHBwcF9yZWdpc3Rlcl9uZXRfY2hhbm5lbA0K PiByZWZlcmVuY2UgaGFzIG5vdCB5ZXQgYmVlbiBkcm9wcGVkLg0KPiANCj4gTWF5YmUgdGhlcmUg aXMgYW4gaXNzdWUgd2l0aCB0aGUgcmVmZXJlbmNlIGNvdW50aW5nIG9yIGEgcmFjZSBvZiBzb21l DQo+IHNvcnQ/DQo+IA0KPiA+IEkgY2hlY2tlZCB0aGUgY29tbWl0IGhpc3RvcnkgYW5kIGZvdW5k IHRoYXQgdGhpcyBwcm9ibGVtIGlzIGludHJvZHVjZWQgZnJvbQ0KPiA+IDRjZjQ3NmNlZDQ1ZDcg KCJwcHA6IGFkZCBQUFBJT0NCUklER0VDSEFOIGFuZCBQUFBJT0NVTkJSSURHRUNIQU4gaW9jdGxz IikuDQo+ID4gDQo+ID4gSSBoYXZlIG5vIGlkZWEgYWJvdXQgaG93IHRvIGdlbmVyYXRlIGEgc3Vp dGFibGUgcGF0Y2gsIHNvcnJ5Lg0KDQpUaGlzIGlzc3VlIHdhcyByZXBvcnRlZCBieSBhIHBhdGgt c2Vuc2l0aXZlIHN0YXRpYyBhbmFseXplciBkZXZlbG9wZWQgYnkgb3VyIExhYiwNCnRodXMgaSBo YXZlIG5vdCBhIGNyYXNoIG9yIGJ1ZyBsb2cuDQoNCkFzIHRoZSByZXR1cm4gdHlwZSBvZiBwcHBf dW5icmlkZ2VfY2hhbm5lbHMoKSBpcyBhIGludCwgY2FuIHdlIHJldHVybiBhIHZhbHVlIHRvDQpp bmZvcm0gY2FsbGVyIHRoYXQgdGhlIGNoYW5uZWwgaXMgZnJlZWQ/DQoNCg==