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 E279DC49ED7 for ; Mon, 16 Sep 2019 13:29:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B7FCC214DE for ; Mon, 16 Sep 2019 13:29:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733273AbfIPN3R (ORCPT ); Mon, 16 Sep 2019 09:29:17 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:44386 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733261AbfIPN3P (ORCPT ); Mon, 16 Sep 2019 09:29:15 -0400 Received: by mail-io1-f71.google.com with SMTP id m3so24310304ion.11 for ; Mon, 16 Sep 2019 06:29:13 -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=EkMMZHB3EbIkeShCeJ9qFKu38co2EiVjf80B4DMO6dU=; b=VWB+Xf2CkqjFSci1dFH3tynMmV1Z1fFBw33v0OoYwh07Rmvj7J6+oinfNlxeFZS6YM g2Fp+MrYR3hBXiP90bnjN3S99Anhwr71PYDLFDW7Q76xYKX8+Eeq8wImaAbyIdhlEbuR G+X0M4VH+VNTpv+Dt6QXQBH6ObRoAaWHKtJRlHo1M0vcH8G4RW3WXSvpqeQFyFhd9Mmw jo/8zhK4Xjd16db3sRJfVXLKHU5Sn1khYMT0m7Bsv1tln1xQKm8irFxprf221FZ2aKCA ke+U9wleh51HrRU+htDv2jfYN+mlCxCGZsz/zJdLMgYKeBy5QM7gRT9pdyWxhToFROYl Iy4A== X-Gm-Message-State: APjAAAVBLPqYPf/pLvh9qmRWx+/QbdRcpXtYsSSewoSwM9azBdFIQZ2Q G1B3zsJG8ztTLU+0CAvgE0kQAgkIKG1AwhO1zkWRU4PMBOIb X-Google-Smtp-Source: APXvYqw9xNlxuBH3SE2H+WjyP/xzJfwaCvWcbemzs9/Lwoe67YDmbIfyjfIh1bJThQo5+3RYu8Q+2aQRIF7iQq7+DVYQgj+GMKty MIME-Version: 1.0 X-Received: by 2002:a02:7113:: with SMTP id n19mr23675349jac.82.1568640552607; Mon, 16 Sep 2019 06:29:12 -0700 (PDT) Date: Mon, 16 Sep 2019 06:29:12 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000eb2d700592ab96a0@google.com> Subject: KASAN: use-after-free Write in usbvision_decompress_alloc From: syzbot To: allison@lohutok.net, andreyknvl@google.com, bigeasy@linutronix.de, gregkh@linuxfoundation.org, hverkuil@xs4all.nl, kjlu@umn.edu, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@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=176af9fa600000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5 dashboard link: https://syzkaller.appspot.com/bug?extid=37e33be6d077b2c85b4a compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+37e33be6d077b2c85b4a@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in usbvision_decompress_alloc+0x63/0x70 drivers/media/usb/usbvision/usbvision-core.c:376 Write of size 8 at addr ffff8881d3989ca0 by task v4l_id/9731 CPU: 0 PID: 9731 Comm: v4l_id Not tainted 5.3.0-rc7+ #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+0xca/0x13e lib/dump_stack.c:113 print_address_description+0x6a/0x32c mm/kasan/report.c:351 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 kasan_report+0xe/0x12 mm/kasan/common.c:618 usbvision_decompress_alloc+0x63/0x70 drivers/media/usb/usbvision/usbvision-core.c:376 usbvision_v4l2_open+0x2b7/0x2f0 drivers/media/usb/usbvision/usbvision-video.c:329 v4l2_open+0x20f/0x3d0 drivers/media/v4l2-core/v4l2-dev.c:423 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x494/0x1120 fs/open.c:797 do_last fs/namei.c:3416 [inline] path_openat+0x1430/0x3f50 fs/namei.c:3533 do_filp_open+0x1a1/0x280 fs/namei.c:3563 do_sys_open+0x3c0/0x580 fs/open.c:1089 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd7a6293120 Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24 RSP: 002b:00007fff16a863b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff16a86518 RCX: 00007fd7a6293120 RDX: 00007fd7a6548138 RSI: 0000000000000000 RDI: 00007fff16a87f1b RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884 R13: 00007fff16a86510 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 2755: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:493 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:466 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] usbvision_alloc drivers/media/usb/usbvision/usbvision-video.c:1310 [inline] usbvision_probe.cold+0x586/0x1e57 drivers/media/usb/usbvision/usbvision-video.c:1464 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 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 2755: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:455 slab_free_hook mm/slub.c:1423 [inline] slab_free_freelist_hook mm/slub.c:1474 [inline] slab_free mm/slub.c:3016 [inline] kfree+0xe4/0x2f0 mm/slub.c:3957 usbvision_release+0x181/0x1c0 drivers/media/usb/usbvision/usbvision-video.c:1359 usbvision_disconnect+0x16c/0x1d0 drivers/media/usb/usbvision/usbvision-video.c:1582 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1134 [inline] device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556 device_del+0x420/0xb10 drivers/base/core.c:2339 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199 hub_port_connect drivers/usb/core/hub.c:4949 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881d3988000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7328 bytes inside of 8192-byte region [ffff8881d3988000, ffff8881d398a000) The buggy address belongs to the page: page:ffffea00074e6200 refcount:1 mapcount:0 mapping:ffff8881da00c500 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 ffffea0007174200 0000000300000003 ffff8881da00c500 raw: 0000000000000000 0000000080030003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d3989b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d3989c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881d3989c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d3989d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d3989d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.