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=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 010F4CA9EC5 for ; Wed, 30 Oct 2019 19:22:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0B95204FD for ; Wed, 30 Oct 2019 19:22:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726506AbfJ3TWL (ORCPT ); Wed, 30 Oct 2019 15:22:11 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:46673 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726268AbfJ3TWK (ORCPT ); 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Wed, 30 Oct 2019 12:22:07 -0700 (PDT) Date: Wed, 30 Oct 2019 12:22:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000013c4c1059625a655@google.com> Subject: KMSAN: uninit-value in cdc_ncm_set_dgram_size From: syzbot To: davem@davemloft.net, glider@google.com, 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: 96c6c319 net: kasan: kmsan: support CONFIG_GENERIC_CSUM on.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=11f103bce00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360 dashboard link: https://syzkaller.appspot.com/bug?extid=0631d878823ce2411636 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10dd9774e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13651a24e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0631d878823ce2411636@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in cdc_ncm_set_dgram_size+0x6ba/0xbc0 drivers/net/usb/cdc_ncm.c:587 CPU: 0 PID: 11865 Comm: kworker/0:3 Not tainted 5.4.0-rc5+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 cdc_ncm_set_dgram_size+0x6ba/0xbc0 drivers/net/usb/cdc_ncm.c:587 cdc_ncm_setup drivers/net/usb/cdc_ncm.c:673 [inline] cdc_ncm_bind_common+0x2b54/0x3c50 drivers/net/usb/cdc_ncm.c:928 cdc_ncm_bind+0x2de/0x330 drivers/net/usb/cdc_ncm.c:1042 usbnet_probe+0x10d3/0x39d0 drivers/net/usb/usbnet.c:1730 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2202 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2202 usb_new_device+0x23e5/0x2fb0 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+0x581d/0x72f0 drivers/usb/core/hub.c:5441 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x189c/0x2460 kernel/workqueue.c:2417 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----max_datagram_size@cdc_ncm_set_dgram_size Variable was created at: cdc_ncm_set_dgram_size+0xf5/0xbc0 drivers/net/usb/cdc_ncm.c:564 cdc_ncm_set_dgram_size+0xf5/0xbc0 drivers/net/usb/cdc_ncm.c:564 ===================================================== --- 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