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 20D0BC4CECD for ; Mon, 16 Sep 2019 13:29:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EBA4520644 for ; Mon, 16 Sep 2019 13:29:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733270AbfIPN3P (ORCPT ); Mon, 16 Sep 2019 09:29:15 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:36717 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728041AbfIPN3M (ORCPT ); Mon, 16 Sep 2019 09:29:12 -0400 Received: by mail-io1-f70.google.com with SMTP id g126so50761408iof.3 for ; Mon, 16 Sep 2019 06:29:10 -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=b5laotBV7ygHpU70Ga/Xbaed4IgwjEvAckEgAO+A7E8=; b=VE56FXgbFGI8MuNOQamHe7FC4PGniWrshlER1uv0Fs18+ahgCXjnSuxrAphT+UsVju SnRRuro41ae1qh9fXbQwlZFAB4RP1TpDPIG4lbj0gMn1Md8BHaRYUNJbidvSlVd3Ewcd b2tU57q2+EluV0mayY1N1L26+N8+SrYNrzs2daYHgPpskDeemr9hujU8vIJpCYC2dAqz QxlTDYuS4dlIkZItuLdayTSp/qW/uTG1RjZJI0tt32Zocq5ag+Sk1Oqmdc5cPzL6LtRP jHjZNXy0A/Ot00tmBqwv8bky9SVyyEBK39obwMcUczlddEZEPbgmBJxv0Y88t7i2CRiQ hUDg== X-Gm-Message-State: APjAAAWXR0ezCikwS/WUJjfun/arfnG4/gcwQTik5hZj7EboVuMthUMC kJE5PQWkgbTVmu9cU6k7Ola5UsDg7cLNqZ/Ch4cU0/yCK6SH X-Google-Smtp-Source: APXvYqzi3HjEwadA9ulwQBRY9iUGavcX/vVVGFLeZR/XwfithihO18DjX/LM54HCCZu8WQ65c8N5fPz3R86+MdTtRUQE9pSvYtAc MIME-Version: 1.0 X-Received: by 2002:a02:245:: with SMTP id 66mr10946896jau.30.1568640550276; Mon, 16 Sep 2019 06:29:10 -0700 (PDT) Date: Mon, 16 Sep 2019 06:29:10 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c7b6940592ab9606@google.com> Subject: divide error in cdc_ncm_update_rxtx_max From: syzbot To: andreyknvl@google.com, davem@davemloft.net, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, oliver@neukum.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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=14cd1459600000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5 dashboard link: https://syzkaller.appspot.com/bug?extid=ce366e2b8296e25d84f5 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b4dd85600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=179b7fc1600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ce366e2b8296e25d84f5@syzkaller.appspotmail.com cdc_ncm 1-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 cdc_ncm 1-1:1.0: setting rx_max = 2048 cdc_ncm 1-1:1.0: setting tx_max = 16384 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:cdc_ncm_update_rxtx_max+0xc6e/0xef0 drivers/net/usb/cdc_ncm.c:419 Code: e0 07 38 c2 0f 9e c1 84 d2 0f 95 c0 84 c1 0f 85 35 02 00 00 0f b7 5b 04 81 e3 ff 07 00 00 e8 29 47 f7 fd 31 d2 44 89 e0 31 ff f3 41 89 d5 89 d6 e8 86 48 f7 fd 45 85 ed 0f 85 17 f7 ff ff e8 RSP: 0018:ffff8881da20f030 EFLAGS: 00010246 RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff83469377 RDI: 0000000000000000 RBP: ffff8881c7ba0000 R08: ffff8881da1f9800 R09: ffffed103b645d58 R10: ffffed103b645d57 R11: ffff8881db22eabf R12: 0000000000004000 R13: 0000000000000000 R14: ffff8881d35f3dc0 R15: ffff8881d2a70f00 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1059879000 CR3: 00000001d49db000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace ab75cc10e099d8e9 ]--- RIP: --- 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