------------[ cut here ]------------
kernfs_put: syz7/pids.events: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 17114 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
------------[ cut here ]------------
Modules linked in:
WARNING: CPU: 0 PID: 25465 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
CPU: 1 PID: 17114 Comm: kworker/1:1 Not tainted 5.19.0-rc4-next-20220704 #1
Modules linked in:
CPU: 0 PID: 25465 Comm: syz-executor.7 Not tainted 5.19.0-rc4-next-20220704 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:kernfs_get.part.0+0x69/0x80
Workqueue: events kernfs_notify_workfn
Code: 31 ff 89 ee e8 c8 0c a7 ff 85 ed 74 18 e8 ef 0f a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 d7 0f a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
RSP: 0018:ffff8880486ffa40 EFLAGS: 00010093
RIP: 0010:kernfs_put.part.0+0x433/0x540
RAX: 0000000000000000 RBX: ffff888032547910 RCX: 0000000000000000
RDX: ffff88802026b580 RSI: ffffffff819de5c9 RDI: 0000000000000005
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 73 0b a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 58 72 84 e8 93 9c 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
RSP: 0018:ffff88804792fbd8 EFLAGS: 00010286
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888032547910 R15: ffff8880433e7d30
FS: 0000555556fd4400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd031b96f64 CR3: 00000000377da000 CR4: 0000000000350ef0
RDX: ffff888044d8d040 RSI: ffffffff812bd348 RDI: ffffed1008f25f6d
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
RBP: ffff888032547948 R08: 0000000000000005 R09: 0000000000000000
Call Trace:
kernfs_get+0x1b/0x30
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888032547910
kernfs_notify+0x180/0x350
R13: ffff888044d79570 R14: 0000000000000000 R15: ffff888014bc9dc0
cgroup_file_notify+0xf5/0x1a0
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
pids_can_fork+0x22f/0x370
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b39f0a3a4 CR3: 00000000377f4000 CR4: 0000000000350ee0
cgroup_can_fork+0x332/0x11b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
copy_process+0x4023/0x6d60
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernel_clone+0xe7/0xa60
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
__do_sys_clone+0xba/0x100
process_one_work+0xa0f/0x1690
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
worker_thread+0x637/0x1250
RIP: 0033:0x7fe3d3c54f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffe38b3fd48 EFLAGS: 00000206
kthread+0x2ed/0x3a0
ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe3d11a8700 RCX: 00007fe3d3c54f41
RDX: 00007fe3d11a89d0 RSI: 00007fe3d11a82f0 RDI: 00000000003d0f00
ret_from_fork+0x22/0x30
RBP: 00007ffe38b3ff80 R08: 00007fe3d11a8700 R09: 00007fe3d11a8700
R10: 00007fe3d11a89d0 R11: 0000000000000206 R12: 00007ffe38b3fdfe
irq event stamp: 687075
R13: 00007ffe38b3fdff R14: 00007fe3d11a8300 R15: 0000555556fd5d50
hardirqs last enabled at (687085): [] console_emit_next_record.constprop.0+0x648/0x800
irq event stamp: 10226
hardirqs last disabled at (687094): [] sysvec_apic_timer_interrupt+0xb/0xc0
hardirqs last enabled at (10225): [] _raw_spin_unlock_irq+0x1f/0x40
softirqs last enabled at (686694): [] __irq_exit_rcu+0x113/0x170
hardirqs last disabled at (10226): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last disabled at (686577): [] __irq_exit_rcu+0x113/0x170
softirqs last enabled at (10204): [] fpu_clone+0x3be/0xb00
---[ end trace 0000000000000000 ]---
softirqs last disabled at (10202): [] fpu_clone+0x331/0xb00
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in kernfs_get.part.0+0x5e/0x80
Write of size 4 at addr ffff888032547910 by task syz-executor.7/25465
CPU: 0 PID: 25465 Comm: syz-executor.7 Tainted: G W 5.19.0-rc4-next-20220704 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
kasan_check_range+0x35/0x1b0
kernfs_get.part.0+0x5e/0x80
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
pids_can_fork+0x22f/0x370
cgroup_can_fork+0x332/0x11b0
copy_process+0x4023/0x6d60
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fe3d3c54f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffe38b3fd48 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe3d11a8700 RCX: 00007fe3d3c54f41
RDX: 00007fe3d11a89d0 RSI: 00007fe3d11a82f0 RDI: 00000000003d0f00
RBP: 00007ffe38b3ff80 R08: 00007fe3d11a8700 R09: 00007fe3d11a8700
R10: 00007fe3d11a89d0 R11: 0000000000000206 R12: 00007ffe38b3fdfe
R13: 00007ffe38b3fdff R14: 00007fe3d11a8300 R15: 0000555556fd5d50
Allocated by task 7082:
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
__kernfs_create_file+0x51/0x350
cgroup_addrm_files+0x3e2/0x9d0
css_populate_dir+0x19b/0x450
cgroup_apply_control_enable+0x3ae/0xa40
cgroup_mkdir+0x824/0x11f0
kernfs_iop_mkdir+0x149/0x1d0
vfs_mkdir+0x417/0x6a0
do_mkdirat+0x17b/0x2e0
__x64_sys_mkdir+0xf2/0x140
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 17114:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0x108/0x190
kmem_cache_free+0xfb/0x600
kernfs_put.part.0+0x2c7/0x540
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff888032547910
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff888032547910, ffff8880325479b8)
The buggy address belongs to the physical page:
page:00000000752ece35 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32547
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000001 ffff8880080358c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888032547800: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00
ffff888032547880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff888032547900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888032547980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00
ffff888032547a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================