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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 EC5ACC10F13 for ; Sun, 14 Apr 2019 20:06:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C047120850 for ; Sun, 14 Apr 2019 20:06:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727297AbfDNUGJ (ORCPT ); Sun, 14 Apr 2019 16:06:09 -0400 Received: from mail-it1-f197.google.com ([209.85.166.197]:55181 "EHLO mail-it1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a05:660c:50:: with SMTP id p16mr1734429itk.3.1555272368165; Sun, 14 Apr 2019 13:06:08 -0700 (PDT) Date: Sun, 14 Apr 2019 13:06:08 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000089d7f058683115e@google.com> Subject: KASAN: slab-out-of-bounds Read in technisat_usb2_rc_query From: syzbot To: andreyknvl@google.com, hans.verkuil@cisco.com, keescook@chromium.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com 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: 9a33b369 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan/tree/usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=1441219f200000 kernel config: https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15 dashboard link: https://syzkaller.appspot.com/bug?extid=eaaaf38a95427be88f4b compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=174a67bb200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17aa2023200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+eaaaf38a95427be88f4b@syzkaller.appspotmail.com rc rc1: Technisat SkyStar USB HD (DVB-S/S2) as /devices/platform/dummy_hcd.0/usb1/1-1/rc/rc1 input: Technisat SkyStar USB HD (DVB-S/S2) as /devices/platform/dummy_hcd.0/usb1/1-1/rc/rc1/input10 rc rc1: lirc_dev: driver technisat-usb2 registered at minor = 1, raw IR receiver, no transmitter dvb-usb: schedule remote query interval to 100 msecs. ================================================================== BUG: KASAN: slab-out-of-bounds in technisat_usb2_get_ir drivers/media/usb/dvb-usb/technisat-usb2.c:664 [inline] BUG: KASAN: slab-out-of-bounds in technisat_usb2_rc_query+0x5fa/0x660 drivers/media/usb/dvb-usb/technisat-usb2.c:679 Read of size 1 at addr ffff8880a8791ea8 by task kworker/0:1/12 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc4-319354-g9a33b36 #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events dvb_usb_read_remote_control Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 print_address_description+0x6c/0x236 mm/kasan/report.c:187 kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317 technisat_usb2_get_ir drivers/media/usb/dvb-usb/technisat-usb2.c:664 [inline] technisat_usb2_rc_query+0x5fa/0x660 drivers/media/usb/dvb-usb/technisat-usb2.c:679 dvb_usb_read_remote_control drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:128 [inline] dvb_usb_read_remote_control+0xe5/0x1c0 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:105 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 615: set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:152 [inline] dvb_usb_device_init.cold+0x317/0x10b3 drivers/media/usb/dvb-usb/dvb-usb-init.c:277 technisat_usb2_probe+0x82/0x2d0 drivers/media/usb/dvb-usb/technisat-usb2.c:763 usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361 really_probe+0x2da/0xb10 drivers/base/dd.c:509 driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 __device_attach+0x223/0x3a0 drivers/base/dd.c:844 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 device_add+0xad2/0x16e0 drivers/base/core.c:2106 usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021 generic_probe+0xa2/0xda drivers/usb/core/generic.c:210 usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266 really_probe+0x2da/0xb10 drivers/base/dd.c:509 driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 __device_attach+0x223/0x3a0 drivers/base/dd.c:844 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 device_add+0xad2/0x16e0 drivers/base/core.c:2106 usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x138e/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 1: set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1429 [inline] slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456 slab_free mm/slub.c:3003 [inline] kfree+0xce/0x290 mm/slub.c:3958 krealloc+0x7d/0xc0 mm/slab_common.c:1570 add_sysfs_param.isra.0+0xcd/0x930 kernel/params.c:633 kernel_add_sysfs_param kernel/params.c:794 [inline] param_sysfs_builtin kernel/params.c:833 [inline] param_sysfs_init+0x364/0x435 kernel/params.c:954 do_one_initcall+0xde/0x597 init/main.c:901 do_initcall_level init/main.c:969 [inline] do_initcalls init/main.c:977 [inline] do_basic_setup init/main.c:995 [inline] kernel_init_freeable+0x4da/0x5c7 init/main.c:1150 kernel_init+0x12/0x1ca init/main.c:1068 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a8791dc0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 232 bytes inside of 256-byte region [ffff8880a8791dc0, ffff8880a8791ec0) The buggy address belongs to the page: page:ffffea0002a1e440 count:1 mapcount:0 mapping:ffff88812c3f4e00 index:0x0 flags: 0xfff00000000200(slab) raw: 00fff00000000200 dead000000000100 dead000000000200 ffff88812c3f4e00 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8791d80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff8880a8791e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8880a8791e80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a8791f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a8791f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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