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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 3B2F5C4CECD for ; Mon, 16 Sep 2019 13:29:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1B8FC214DE for ; Mon, 16 Sep 2019 13:29:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733243AbfIPN3N (ORCPT ); Mon, 16 Sep 2019 09:29:13 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:52882 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733221AbfIPN3L (ORCPT ); Mon, 16 Sep 2019 09:29:11 -0400 Received: by mail-io1-f69.google.com with SMTP id g8so5840648iop.19 for ; Mon, 16 Sep 2019 06:29:09 -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=Is+d6dqD59UDWyRn9HoG+eKzIMsqRNy0LD3MnVyhGVI=; b=KOncstS/mkY4laYXmdIShikQBGnNXdDwLa7oEOtTU3RmqjHb6pHzIWfNRUsINFnKU5 ouDgOwnDEzTNVbei+Itap+NuaJGovgfkwnClcT1D4eGModvOvO8WokJmWRQcocbiVJ23 74b5OHRv/hNcu8kvfeDHISlBj0j6+ZWFL/PQvjkbmnivtHov2l0APjC6ikik1WETD9Pb gdpHP8MSk3WaTXld9dGbkv/Mz1C3jkM4qcOUwtHZzs54cDpcFXWhSqbtoiY1T2VOFpJu PVqE5Sj4Ux0lJggmPeDUYvnjxqAuYlxkcrg2PB1N0vSxQ9v0aUok8+5llOWEywn20xMy YN2g== X-Gm-Message-State: APjAAAWVnuTXVJigexbzOnnl0xNq4m3un9qVuBoKugzsrj/r23xIzM4I q+3BTg4n0G0wO7hPs4ZD8ooMAYoJiwLuJdz0ciDjt1uZYRR5 X-Google-Smtp-Source: APXvYqyLzrn6iiZVIWcm8eZceVi2PWZgTGKMtrYR8hDkGckeZGGAiakb+t1cexOZtT1aVd0Pc+k6T4mPfu7iBujPeYOMDpVBs75b MIME-Version: 1.0 X-Received: by 2002:a02:c8cd:: with SMTP id q13mr402813jao.133.1568640549268; Mon, 16 Sep 2019 06:29:09 -0700 (PDT) Date: Mon, 16 Sep 2019 06:29:09 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b83b550592ab965b@google.com> Subject: divide error in usbnet_update_max_qlen From: syzbot To: andreyknvl@google.com, davem@davemloft.net, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, oneukum@suse.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=117659fa600000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5 dashboard link: https://syzkaller.appspot.com/bug?extid=6102c120be558c885f04 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12107ba9600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=146014e6600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6102c120be558c885f04@syzkaller.appspotmail.com usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 cdc_ncm 1-1:1.0: MAC-Address: 42:42:42:42:42:42 cdc_ncm 1-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 cdc_ncm 1-1:1.0: setting rx_max = 2048 divide error: 0000 [#1] SMP KASAN CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:usbnet_update_max_qlen drivers/net/usb/usbnet.c:344 [inline] RIP: 0010:usbnet_update_max_qlen+0x231/0x370 drivers/net/usb/usbnet.c:338 Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 46 01 00 00 48 8d bb f4 00 00 00 31 d2 b8 c8 63 01 00 48 89 f9 <48> f7 b3 a8 01 00 00 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 0f RSP: 0018:ffff8881da20f010 EFLAGS: 00010246 RAX: 00000000000163c8 RBX: ffff8881d5ad8ac0 RCX: ffff8881d5ad8bb4 RDX: 0000000000000000 RSI: ffffffff8344ecde RDI: ffff8881d5ad8bb4 RBP: 0000000000000003 R08: ffff8881da1f9800 R09: ffffed103ab5b00a R10: ffffed103ab5b009 R11: ffff8881d5ad804f R12: 0000000000000000 R13: ffff8881d5ad8c38 R14: ffff8881d5ad8ac0 R15: ffff8881d2820c80 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f26d0180000 CR3: 00000001d38dd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cdc_ncm_update_rxtx_max+0x8e9/0xef0 drivers/net/usb/cdc_ncm.c:440 cdc_ncm_setup drivers/net/usb/cdc_ncm.c:667 [inline] cdc_ncm_bind_common+0x1005/0x2570 drivers/net/usb/cdc_ncm.c:924 cdc_ncm_bind+0x7c/0x1c0 drivers/net/usb/cdc_ncm.c:1038 usbnet_probe+0xb43/0x23cf drivers/net/usb/usbnet.c:1722 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2165 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2165 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches