linux-kernel - upstream boot error: KASAN: global-out-of-bounds Read in internal_create

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Date:   Wed, 12 Aug 2020 00:26:21 -0700
From:   syzbot <syzbot+1cf0ffe61aecf46f588f@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: upstream boot error: KASAN: global-out-of-bounds Read in internal_create_group

Hello,

syzbot found the following issue on:

HEAD commit:    fb893de3 Merge tag 'tag-chrome-platform-for-v5.9' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1323384a900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b4f36703531c4ada
dashboard link: https://syzkaller.appspot.com/bug?extid=1cf0ffe61aecf46f588f
compiler:       gcc (GCC) 10.1.0-syz 20200507

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1cf0ffe61aecf46f588f@...kaller.appspotmail.com

==================================================================
BUG: KASAN: global-out-of-bounds in create_files fs/sysfs/group.c:43 [inline]
BUG: KASAN: global-out-of-bounds in internal_create_group+0x9d8/0xb20 fs/sysfs/group.c:149
Read of size 8 at addr ffffffff8a2e4cf0 by task kworker/u17:10/959

CPU: 2 PID: 959 Comm: kworker/u17:10 Not tainted 5.8.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events_unbound async_run_entry_fn
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 create_files fs/sysfs/group.c:43 [inline]
 internal_create_group+0x9d8/0xb20 fs/sysfs/group.c:149
 internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:185 [inline]
 sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:215
 device_add_groups drivers/base/core.c:2024 [inline]
 device_add_attrs drivers/base/core.c:2178 [inline]
 device_add+0x7fd/0x1c40 drivers/base/core.c:2881
 nd_async_device_register+0x12/0x80 drivers/nvdimm/bus.c:506
 async_run_entry_fn+0x121/0x530 kernel/async.c:123
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the variable:
 nvdimm_firmware_attributes+0x10/0x40

Memory state around the buggy address:
 ffffffff8a2e4b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8a2e4c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff8a2e4c80: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 00 f9 f9
                                                             ^
 ffffffff8a2e4d00: f9 f9 f9 f9 00 00 00 00 00 00 00 f9 f9 f9 f9 f9
 ffffffff8a2e4d80: 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 00 00 00 00
==================================================================


---
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