linux-kernel - [syzbot] KASAN: null-ptr-deref Write in kcm_tx

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Message-ID: <0000000000006aa20b05d5876c1f@google.com>
Date:   Fri, 14 Jan 2022 01:28:19 -0800
From:   syzbot <syzbot+25ca556057c68f8a03a2@...kaller.appspotmail.com>
To:     aahringo@...hat.com, andrii@...nel.org, ast@...nel.org,
        bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net,
        john.fastabend@...il.com, kafai@...com, kpsingh@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, paskripkin@...il.com,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        unixbhaskar@...il.com, yhs@...com
Subject: [syzbot] KASAN: null-ptr-deref Write in kcm_tx_work (2)

Hello,

syzbot found the following issue on:

HEAD commit:    df0cc57e057f Linux 5.16
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a89d2db00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ea1f52f5503d3ac3
dashboard link: https://syzkaller.appspot.com/bug?extid=25ca556057c68f8a03a2
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+25ca556057c68f8a03a2@...kaller.appspotmail.com

==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:86 [inline]
BUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
BUG: KASAN: null-ptr-deref in kcm_tx_work+0xff/0x160 net/kcm/kcmsock.c:741
Write of size 8 at addr 0000000000000008 by task kworker/u4:47/7955

CPU: 1 PID: 7955 Comm: kworker/u4:47 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kkcmd kcm_tx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:437 [inline]
 kasan_report.cold+0x66/0xdf mm/kasan/report.c:450
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_write include/linux/instrumented.h:86 [inline]
 clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
 kcm_tx_work+0xff/0x160 net/kcm/kcmsock.c:741
 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298
 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7955 Comm: kworker/u4:47 Tainted: G    B             5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kkcmd kcm_tx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 panic+0x2b0/0x6dd kernel/panic.c:232
 end_report.cold+0x63/0x6f mm/kasan/report.c:128
 __kasan_report mm/kasan/report.c:440 [inline]
 kasan_report.cold+0x71/0xdf mm/kasan/report.c:450
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_write include/linux/instrumented.h:86 [inline]
 clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
 kcm_tx_work+0xff/0x160 net/kcm/kcmsock.c:741
 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298
 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..

---
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