linux-kernel - [syzbot] KASAN: null-ptr-deref Read in do_journal

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Message-ID: <00000000000034d16305e50acc8d@google.com>
Date:   Sat, 30 Jul 2022 12:30:21 -0700
From:   syzbot <syzbot+845cd8e5c47f2a125683@...kaller.appspotmail.com>
To:     damien.lemoal@...nsource.wdc.com, jack@...e.cz, jlayton@...nel.org,
        linux-kernel@...r.kernel.org, neilb@...e.de,
        reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        willy@...radead.org
Subject: [syzbot] KASAN: null-ptr-deref Read in do_journal_end (2)

Hello,

syzbot found the following issue on:

HEAD commit:    620725263f42 Merge tag 'mm-hotfixes-stable-2022-07-29' of ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13ee9c82080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=26034e6fe0075dad
dashboard link: https://syzkaller.appspot.com/bug?extid=845cd8e5c47f2a125683
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+845cd8e5c47f2a125683@...kaller.appspotmail.com

==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
BUG: KASAN: null-ptr-deref in set_buffer_uptodate include/linux/buffer_head.h:120 [inline]
BUG: KASAN: null-ptr-deref in do_journal_end+0x135f/0x4b00 fs/reiserfs/journal.c:4080
Read of size 8 at addr 0000000000000000 by task syz-executor.4/7438

CPU: 0 PID: 7438 Comm: syz-executor.4 Not tainted 5.19.0-rc8-syzkaller-00152-g620725263f42 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_report mm/kasan/report.c:432 [inline]
 kasan_report.cold+0x61/0x1c6 mm/kasan/report.c:491
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 set_buffer_uptodate include/linux/buffer_head.h:120 [inline]
 do_journal_end+0x135f/0x4b00 fs/reiserfs/journal.c:4080
 reiserfs_sync_fs+0xf8/0x120 fs/reiserfs/super.c:78
 sync_filesystem.part.0+0x75/0x1d0 fs/sync.c:56
 sync_filesystem+0x8b/0xc0 fs/sync.c:43
 generic_shutdown_super+0x70/0x400 fs/super.c:445
 kill_block_super+0x97/0xf0 fs/super.c:1394
 deactivate_locked_super+0x94/0x160 fs/super.c:332
 deactivate_super+0xad/0xd0 fs/super.c:363
 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1186
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5f3988a677
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcab38a818 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f5f3988a677
RDX: 00007ffcab38a8eb RSI: 000000000000000a RDI: 00007ffcab38a8e0
RBP: 00007ffcab38a8e0 R08: 00000000ffffffff R09: 00007ffcab38a6b0
R10: 000055555635d8b3 R11: 0000000000000246 R12: 00007f5f398e22a6
R13: 00007ffcab38b9a0 R14: 000055555635d810 R15: 00007ffcab38b9e0
 </TASK>
==================================================================


---
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