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=-4.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 8519CC433E0 for ; Mon, 20 Jul 2020 08:38:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CBC021775 for ; Mon, 20 Jul 2020 08:38:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727866AbgGTIiW (ORCPT ); Mon, 20 Jul 2020 04:38:22 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:36535 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726775AbgGTIiV (ORCPT ); Mon, 20 Jul 2020 04:38:21 -0400 Received: by mail-io1-f70.google.com with SMTP id g17so10816451iob.3 for ; Mon, 20 Jul 2020 01:38:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=/pOe/UkZvEbGdAr/dvElx60N9w3UN5J6FPFhS9jd4kw=; b=npp0QZqFQWwWgIudKlNWvikbgtWAr/I8PmGXNE6UGyo5cAam5NZSg7k4ZcrJ3kXd4Y Yd5QbmqrEG6mLLcukpTVQgEfipQcBTm55HqT+aymEFAvxescgXGGb7Kq5S9IkmI7eYff 8isaC9XpccT5rRKMubKWb2N6wdWksAOWv3WnvvX8X/UFcvEPXVuF1zsu/ydz3yPqsI42 PQGSBRDh7EbaBLvsq90li1tpaB7nCvICDlk+weMGCdz2JrhpZYPE+e3xefedy7euZEVI xg6LnZCzgB2YGxrjPyYPzmZy0/p9IYB1RpPofg05z1TkD51FQsSPUWsTH0QtE5IXCvOF pAFw== X-Gm-Message-State: AOAM531w/90JbbZr5k3u2YO/mNlqlqII078sHopKZSb4TVeTnihV2pDx xuLIyfh3anb29dSCZTZ5DEebQcps5qwcGE+/BJd7PV3htere X-Google-Smtp-Source: ABdhPJwnov5TdEhruF9H8/3cc9pPFy7sHqEeJyx5tApwl0rCBv55Mu9kWxW0CC1ay4unneBlIl+JTwxC+/vGYsVMxLrVry4yK6wL MIME-Version: 1.0 X-Received: by 2002:a6b:4409:: with SMTP id r9mr21589476ioa.158.1595234300358; Mon, 20 Jul 2020 01:38:20 -0700 (PDT) Date: Mon, 20 Jul 2020 01:38:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ce768d05aadb6da0@google.com> Subject: KASAN: use-after-free Read in xfrm6_tunnel_alloc_spi From: syzbot To: davem@davemloft.net, herbert@gondor.apana.org.au, kuba@kernel.org, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 4c43049f Add linux-next specific files for 20200716 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15243307100000 kernel config: https://syzkaller.appspot.com/x/.config?x=2c76d72659687242 dashboard link: https://syzkaller.appspot.com/bug?extid=12f1afb7271ae16d5d9e compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+12f1afb7271ae16d5d9e@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __xfrm6_tunnel_alloc_spi net/ipv6/xfrm6_tunnel.c:124 [inline] BUG: KASAN: use-after-free in xfrm6_tunnel_alloc_spi+0x779/0x8a0 net/ipv6/xfrm6_tunnel.c:174 Read of size 4 at addr ffff88808b7da400 by task syz-executor.4/8451 CPU: 0 PID: 8451 Comm: syz-executor.4 Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __xfrm6_tunnel_alloc_spi net/ipv6/xfrm6_tunnel.c:124 [inline] xfrm6_tunnel_alloc_spi+0x779/0x8a0 net/ipv6/xfrm6_tunnel.c:174 ipcomp6_tunnel_create net/ipv6/ipcomp6.c:84 [inline] ipcomp6_tunnel_attach net/ipv6/ipcomp6.c:124 [inline] ipcomp6_init_state net/ipv6/ipcomp6.c:159 [inline] ipcomp6_init_state+0x2af/0x700 net/ipv6/ipcomp6.c:139 __xfrm_init_state+0x9a6/0x14b0 net/xfrm/xfrm_state.c:2498 xfrm_init_state+0x1a/0x70 net/xfrm/xfrm_state.c:2525 pfkey_msg2xfrm_state net/key/af_key.c:1291 [inline] pfkey_add+0x1a10/0x2b70 net/key/af_key.c:1508 pfkey_process+0x66d/0x7a0 net/key/af_key.c:2834 pfkey_sendmsg+0x42d/0x800 net/key/af_key.c:3673 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x331/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmmsg+0x195/0x480 net/socket.c:2506 __do_sys_sendmmsg net/socket.c:2535 [inline] __se_sys_sendmmsg net/socket.c:2532 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2532 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f09fcf03c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000025a40 RCX: 000000000045c1d9 RDX: 0400000000000282 RSI: 0000000020000180 RDI: 0000000000000003 RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffc814f8eff R14: 00007f09fcf049c0 R15: 000000000078bf0c The buggy address belongs to the page: page:00000000166c48c0 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x8b7da flags: 0xfffe0000000000() raw: 00fffe0000000000 ffffea00029cc808 ffffea00029b8b88 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808b7da300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88808b7da380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88808b7da400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88808b7da480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88808b7da500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== --- This report is generated by a bot. 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