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 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 F2794C43215 for ; Mon, 2 Dec 2019 09:25:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D454624249 for ; Mon, 2 Dec 2019 09:25:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727368AbfLBJZI (ORCPT ); Mon, 2 Dec 2019 04:25:08 -0500 Received: from mail-il1-f199.google.com ([209.85.166.199]:43781 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726251AbfLBJZH (ORCPT ); Mon, 2 Dec 2019 04:25:07 -0500 Received: by mail-il1-f199.google.com with SMTP id m67so7572211ill.10 for ; Mon, 02 Dec 2019 01:25:07 -0800 (PST) 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=s/fzY9n/Wc759s+X5jwa5PXhW5V1f6rxMUh+sQv+EIU=; b=AeI4AV6L1Hbd64k4sbWbqxKOokivUcyCqUjJb104MeH/5CHurm9l9ZrFF0pu201kMY FELoiRhkFqyiKpmptMYLkhoPnt9fxI+rrF6nmeKiIkdO04bnvaNEtha+9vRm08AdBwQ3 JtGyWDL0GYmbkGwqqM+laZiWc9Wm0xXDUkObEZLbRyRp+w8zJwg7AEBS2bGar/Au8CeA XTsbAfp7m/5yHyTerrVqK3kHqkzWa2y0W1/YxXyCRrv+n8u+3u9+tw/7AInyFpSBzOa+ yys55w1QZQ2CoQ3riQmkNOMCdxizKgkVYP/eZXcYVA0uV7sHKUXX0RB6ckbj52TxYCKT StBg== X-Gm-Message-State: APjAAAXwdmBSRwYRLfkmeqBhhdK4sZ6JO5qoUcoz6RAUyg9xp72ALVSo NslWBmjVH1MnVWBFtqPpFksJ6dKEAIC5Pni/gPOEM/r7SKMa X-Google-Smtp-Source: APXvYqxUgkfSuyTzo7urgNwiNWOccCUAD3r/7Xc6+I7tBgXjkAdKtW2Xb8ndo2wJJNzCx0qC3O1QWtMZvde93oeGiTGB9b+IeVx2 MIME-Version: 1.0 X-Received: by 2002:a92:8995:: with SMTP id w21mr6775582ilk.231.1575278706708; Mon, 02 Dec 2019 01:25:06 -0800 (PST) Date: Mon, 02 Dec 2019 01:25:06 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000bc5c0e0598b52778@google.com> Subject: KASAN: use-after-free Write in as102_release From: syzbot To: allison@lohutok.net, andreyknvl@google.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, rfontana@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 32b5e2b2 usb: gadget: add raw-gadget interface git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=1255457ae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d88612251f7691bd dashboard link: https://syzkaller.appspot.com/bug?extid=edff65c4ade21b5db190 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+edff65c4ade21b5db190@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in atomic_fetch_sub include/asm-generic/atomic-instrumented.h:199 [inline] BUG: KASAN: use-after-free in refcount_sub_and_test include/linux/refcount.h:253 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:281 [inline] BUG: KASAN: use-after-free in kref_put include/linux/kref.h:64 [inline] BUG: KASAN: use-after-free in as102_release+0x58/0xd8 drivers/media/usb/as102/as102_usb_drv.c:458 Write of size 4 at addr ffff8881adb84140 by task syz-executor.5/16315 CPU: 1 PID: 16315 Comm: syz-executor.5 Not tainted 5.4.0-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+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 atomic_fetch_sub include/asm-generic/atomic-instrumented.h:199 [inline] refcount_sub_and_test include/linux/refcount.h:253 [inline] refcount_dec_and_test include/linux/refcount.h:281 [inline] kref_put include/linux/kref.h:64 [inline] as102_release+0x58/0xd8 drivers/media/usb/as102/as102_usb_drv.c:458 __fput+0x2d7/0x840 fs/file_table.c:280 task_work_run+0x13f/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8ab/0x2bc0 kernel/exit.c:797 do_group_exit+0x125/0x340 kernel/exit.c:895 get_signal+0x466/0x23c0 kernel/signal.c:2734 do_signal+0x88/0x1490 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4d1/0x5b0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a4e7 Code: Bad RIP value. RSP: 002b:00007f8274f103c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 000000000045a4e7 RDX: 00007f8274f10810 RSI: 0000000080085502 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00000000004ca701 R14: 00000000004e2e78 R15: 00000000ffffffff Allocated by task 17: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] as102_usb_probe+0x4e/0x3d0 drivers/media/usb/as102/as102_usb_drv.c:350 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 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:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x1480/0x1c20 drivers/base/core.c:2487 usb_set_configuration+0xe67/0x1740 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+0x104/0x210 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:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x1480/0x1c20 drivers/base/core.c:2487 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 hub_port_connect drivers/usb/core/hub.c:5184 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 17: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1424 [inline] slab_free_freelist_hook mm/slub.c:1457 [inline] slab_free mm/slub.c:3004 [inline] kfree+0xdc/0x310 mm/slub.c:3956 as102_usb_probe.cold+0x133/0x366 drivers/media/usb/as102/as102_usb_drv.c:412 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 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:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x1480/0x1c20 drivers/base/core.c:2487 usb_set_configuration+0xe67/0x1740 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+0x104/0x210 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:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0x1480/0x1c20 drivers/base/core.c:2487 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537 hub_port_connect drivers/usb/core/hub.c:5184 [inline] hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] port_event drivers/usb/core/hub.c:5470 [inline] hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 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 ffff8881adb84000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 320 bytes inside of 4096-byte region [ffff8881adb84000, ffff8881adb85000) The buggy address belongs to the page: page:ffffea0006b6e000 refcount:1 mapcount:0 mapping:ffff8881da00c280 index:0x0 compound_mapcount: 0 raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881adb84000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881adb84080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881adb84100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881adb84180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881adb84200: 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.