==================================================================
BUG: KASAN: use-after-free in __kernfs_remove+0x9dd/0xb30
Read of size 2 at addr ffff88803e5cea90 by task syz-executor.5/14561
CPU: 1 PID: 14561 Comm: syz-executor.5 Not tainted 6.0.0-rc2-next-20220825 #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/0x5e5
kasan_report+0xb1/0x1c0
__kernfs_remove+0x9dd/0xb30
kernfs_remove_by_name_ns+0xa8/0x110
sysfs_slab_add+0x142/0x1f0
__kmem_cache_create+0x46e/0x5d0
kmem_cache_create_usercopy+0x1fd/0x2e0
p9_client_create+0xc85/0x1050
v9fs_session_init+0x1dd/0x1670
v9fs_mount+0xb9/0xbd0
legacy_get_tree+0x105/0x220
vfs_get_tree+0x8e/0x300
path_mount+0x1310/0x1e20
__x64_sys_mount+0x282/0x300
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f548e57cb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f548baf2188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f548e68ff60 RCX: 00007f548e57cb19
RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007f548e5d6f6d R08: 0000000020000240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc9473b0ff R14: 00007f548baf2300 R15: 0000000000022000
Allocated by task 14558:
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x3e0
__kernfs_new_node+0xd4/0x8c0
kernfs_create_dir_ns+0x9c/0x230
sysfs_create_dir_ns+0x127/0x290
kobject_add_internal+0x24c/0x8e0
kobject_init_and_add+0x101/0x160
sysfs_slab_add+0x165/0x1f0
__kmem_cache_create+0x46e/0x5d0
kmem_cache_create_usercopy+0x1fd/0x2e0
p9_client_create+0xc85/0x1050
v9fs_session_init+0x1dd/0x1670
v9fs_mount+0xb9/0xbd0
legacy_get_tree+0x105/0x220
vfs_get_tree+0x8e/0x300
path_mount+0x1310/0x1e20
__x64_sys_mount+0x282/0x300
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 14561:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x40
__kasan_slab_free+0x108/0x190
kmem_cache_free+0xf7/0x610
kernfs_put.part.0+0x2c7/0x540
kernfs_put+0x42/0x50
__kernfs_remove+0x7d4/0xb30
kernfs_remove_by_name_ns+0xa8/0x110
sysfs_slab_add+0x142/0x1f0
__kmem_cache_create+0x46e/0x5d0
kmem_cache_create_usercopy+0x1fd/0x2e0
p9_client_create+0xc85/0x1050
v9fs_session_init+0x1dd/0x1670
v9fs_mount+0xb9/0xbd0
legacy_get_tree+0x105/0x220
vfs_get_tree+0x8e/0x300
path_mount+0x1310/0x1e20
__x64_sys_mount+0x282/0x300
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff88803e5ce9f8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 152 bytes inside of
168-byte region [ffff88803e5ce9f8, ffff88803e5ceaa0)
The buggy address belongs to the physical page:
page:000000003a5bb811 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3e5ce
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff88800843d8c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803e5ce980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa
ffff88803e5cea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803e5cea80: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
^
ffff88803e5ceb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803e5ceb80: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14561 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x6d/0x80
Modules linked in:
CPU: 1 PID: 14561 Comm: syz-executor.5 Tainted: G B 6.0.0-rc2-next-20220825 #1
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+0x6d/0x80
Code: e8 a8 de a6 ff 85 ed 74 1c e8 ef e1 a6 ff be 04 00 00 00 48 89 df e8 82 d3 d9 ff f0 ff 03 5b 5d e9 08 6e c1 02 e8 d3 e1 a6 ff <0f> 0b eb db 48 89 df e8 f7 cf d9 ff eb c2 0f 1f 44 00 00 55 48 89
RSP: 0018:ffff88803b697780 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88803e5ce9f8 RCX: ffffc9000860e000
RDX: 0000000000040000 RSI: ffffffff819eccbd RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88803208c5b0 R15: ffff88803e5ce9f8
FS: 00007f548baf2700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffad4330000 CR3: 00000000389b8000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
__kernfs_remove+0x34a/0xb30
kernfs_remove_by_name_ns+0xa8/0x110
sysfs_slab_add+0x142/0x1f0
__kmem_cache_create+0x46e/0x5d0
kmem_cache_create_usercopy+0x1fd/0x2e0
p9_client_create+0xc85/0x1050
v9fs_session_init+0x1dd/0x1670
v9fs_mount+0xb9/0xbd0
legacy_get_tree+0x105/0x220
vfs_get_tree+0x8e/0x300
path_mount+0x1310/0x1e20
__x64_sys_mount+0x282/0x300
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f548e57cb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f548baf2188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f548e68ff60 RCX: 00007f548e57cb19
RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007f548e5d6f6d R08: 0000000020000240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc9473b0ff R14: 00007f548baf2300 R15: 0000000000022000
irq event stamp: 1915
hardirqs last enabled at (1915): [] asm_sysvec_apic_timer_interrupt+0x16/0x20
hardirqs last disabled at (1914): [] __do_softirq+0x6be/0x8d0
softirqs last enabled at (1788): [] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (1779): [] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
Bluetooth: hci6: SCO packet for unknown connection handle 0
Bluetooth: hci6: SCO packet for unknown connection handle 0
Bluetooth: hci6: SCO packet for unknown connection handle 0
Bluetooth: hci6: SCO packet for unknown connection handle 0