Re: [syzbot] [jfs?] KASAN: user-memory-access Read in jfs_statfs

[syzbot <syzbot+cea4fad5485bc30243a9@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    28bbe4ea686a Merge tag 'i2c-for-6.11-rc1-second-batch' of ..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=157aa8e3980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9d240b438cabdc8e
dashboard link: https://syzkaller.appspot.com/bug?extid=cea4fad5485bc30243a9
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13d35b1d980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=120152b1980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd50d9d26f43/disk-28bbe4ea.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5cc17b9d307f/vmlinux-28bbe4ea.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bfb78d6d09b6/bzImage-28bbe4ea.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/0522d99a5f0b/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cea4fad5485bc30243a9@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: user-memory-access in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: user-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: user-memory-access in jfs_statfs+0x20e/0x510 fs/jfs/super.c:140
Read of size 4 at addr 00000000000050c0 by task syz-executor415/5092

CPU: 1 UID: 0 PID: 5092 Comm: syz-executor415 Not tainted 6.10.0-syzkaller-12084-g28bbe4ea686a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_report+0xe8/0x550 mm/kasan/report.c:491
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 jfs_statfs+0x20e/0x510 fs/jfs/super.c:140
 statfs_by_dentry fs/statfs.c:66 [inline]
 vfs_statfs fs/statfs.c:90 [inline]
 user_statfs+0x213/0x460 fs/statfs.c:105
 __do_sys_statfs fs/statfs.c:195 [inline]
 __se_sys_statfs fs/statfs.c:192 [inline]
 __x64_sys_statfs+0xe8/0x1a0 fs/statfs.c:192
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa111cece59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa111c82218 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
RAX: ffffffffffffffda RBX: 00007fa111d7b718 RCX: 00007fa111cece59
RDX: 00007fa111cece59 RSI: 0000000000000000 RDI: 00000000200003c0
RBP: 00007fa111d7b710 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa111d4829c
R13: 0032656c69662f2e R14: a92483129444e42d R15: 00007ffecd531438
 </TASK>
==================================================================


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