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Message-ID: <000000000000414db905b6e9bae8@google.com>
Date: Sun, 20 Dec 2020 10:44:12 -0800
From: syzbot <syzbot+a93fba6d384346a761e3@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org, shuah@...nel.org,
syzkaller-bugs@...glegroups.com, valentina.manea.m@...il.com
Subject: KASAN: null-ptr-deref Write in vhci_shutdown_connection
Hello,
syzbot found the following issue on:
HEAD commit: 5e60366d Merge tag 'fallthrough-fixes-clang-5.11-rc1' of g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13f05613500000
kernel config: https://syzkaller.appspot.com/x/.config?x=503d0089cd701d6d
dashboard link: https://syzkaller.appspot.com/bug?extid=a93fba6d384346a761e3
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d0d8c5500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1058e41f500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a93fba6d384346a761e3@...kaller.appspotmail.com
vhci_hcd: stop threads
vhci_hcd: release socket
vhci_hcd: disconnect device
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:142 [inline]
BUG: KASAN: null-ptr-deref in __refcount_add include/linux/refcount.h:193 [inline]
BUG: KASAN: null-ptr-deref in __refcount_inc include/linux/refcount.h:250 [inline]
BUG: KASAN: null-ptr-deref in refcount_inc include/linux/refcount.h:267 [inline]
BUG: KASAN: null-ptr-deref in get_task_struct include/linux/sched/task.h:102 [inline]
BUG: KASAN: null-ptr-deref in kthread_stop+0x90/0x760 kernel/kthread.c:591
Write of size 4 at addr 0000000000000024 by task kworker/u4:2/46
CPU: 0 PID: 46 Comm: kworker/u4:2 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usbip_event event_handler
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
__kasan_report mm/kasan/report.c:549 [inline]
kasan_report.cold+0x5/0x37 mm/kasan/report.c:562
check_memory_region_inline mm/kasan/generic.c:186 [inline]
check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:142 [inline]
__refcount_add include/linux/refcount.h:193 [inline]
__refcount_inc include/linux/refcount.h:250 [inline]
refcount_inc include/linux/refcount.h:267 [inline]
get_task_struct include/linux/sched/task.h:102 [inline]
kthread_stop+0x90/0x760 kernel/kthread.c:591
vhci_shutdown_connection+0x17f/0x340 drivers/usb/usbip/vhci_hcd.c:1021
event_handler+0x1f0/0x4f0 drivers/usb/usbip/usbip_event.c:78
process_one_work+0x98d/0x1630 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 46 Comm: kworker/u4:2 Tainted: G B 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usbip_event event_handler
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
panic+0x343/0x77f kernel/panic.c:231
end_report+0x58/0x5e mm/kasan/report.c:106
__kasan_report mm/kasan/report.c:552 [inline]
kasan_report.cold+0xd/0x37 mm/kasan/report.c:562
check_memory_region_inline mm/kasan/generic.c:186 [inline]
check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:142 [inline]
__refcount_add include/linux/refcount.h:193 [inline]
__refcount_inc include/linux/refcount.h:250 [inline]
refcount_inc include/linux/refcount.h:267 [inline]
get_task_struct include/linux/sched/task.h:102 [inline]
kthread_stop+0x90/0x760 kernel/kthread.c:591
vhci_shutdown_connection+0x17f/0x340 drivers/usb/usbip/vhci_hcd.c:1021
event_handler+0x1f0/0x4f0 drivers/usb/usbip/usbip_event.c:78
process_one_work+0x98d/0x1630 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This report 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@...glegroups.com.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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