==================================================================
BUG: KASAN: slab-use-after-free in node_maxindex lib/radix-tree.c:218 [inline]
BUG: KASAN: slab-use-after-free in radix_tree_next_chunk+0xad7/0xb20 lib/radix-tree.c:1231
Read of size 1 at addr ffff88804261cb00 by task syz.8.6871/31770
CPU: 1 UID: 0 PID: 31770 Comm: syz.8.6871 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
node_maxindex lib/radix-tree.c:218 [inline]
radix_tree_next_chunk+0xad7/0xb20 lib/radix-tree.c:1231
idr_get_next_ul+0x227/0x2e0 lib/idr.c:236
idr_get_next+0x9b/0x150 lib/idr.c:267
afs_dynroot_readdir_cells fs/afs/dynroot.c:293 [inline]
afs_dynroot_readdir+0x72b/0xb70 fs/afs/dynroot.c:352
iterate_dir+0x293/0xb40 fs/readdir.c:108
__do_compat_sys_getdents fs/readdir.c:579 [inline]
__se_compat_sys_getdents fs/readdir.c:565 [inline]
__ia32_compat_sys_getdents+0x13b/0x2b0 fs/readdir.c:565
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc4579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f4c8155c EFLAGS: 00000296 ORIG_RAX: 000000000000008d
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00000000800008c0
RDX: 0000000000000036 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 31770:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
radix_tree_node_alloc.constprop.0+0x7c/0x350 lib/radix-tree.c:276
idr_get_free+0x528/0xa30 lib/radix-tree.c:1506
idr_alloc_u32+0x190/0x2f0 lib/idr.c:46
idr_alloc_cyclic+0x10b/0x230 lib/idr.c:125
afs_alloc_cell fs/afs/cell.c:203 [inline]
afs_lookup_cell+0xe68/0x1680 fs/afs/cell.c:265
afs_dynroot_lookup_cell fs/afs/dynroot.c:111 [inline]
afs_dynroot_lookup+0x2e2/0xa90 fs/afs/dynroot.c:159
lookup_one_qstr_excl+0x1ce/0x250 fs/namei.c:1697
do_renameat2+0x56d/0xc50 fs/namei.c:5230
__do_sys_rename fs/namei.c:5325 [inline]
__se_sys_rename fs/namei.c:5323 [inline]
__ia32_sys_rename+0x7c/0xa0 fs/namei.c:5323
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 31754:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x2d1/0x4d0 mm/slub.c:4745
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2832
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3094
radix_tree_node_free lib/radix-tree.c:310 [inline]
delete_node+0x1fc/0x8d0 lib/radix-tree.c:573
__radix_tree_delete+0x193/0x3d0 lib/radix-tree.c:1379
radix_tree_delete_item+0xea/0x230 lib/radix-tree.c:1430
afs_cell_destroy+0x1db/0x310 fs/afs/cell.c:523
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2832
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
The buggy address belongs to the object at ffff88804261cb00
which belongs to the cache radix_tree_node of size 576
The buggy address is located 0 bytes inside of
freed 576-byte region [ffff88804261cb00, ffff88804261cd40)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4261c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88804ba2fc01
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801b84cb40 ffffea0001c01400 dead000000000002
raw: 0000000000000000 0000000080170017 00000000f5000000 ffff88804ba2fc01
head: 04fff00000000040 ffff88801b84cb40 ffffea0001c01400 dead000000000002
head: 0000000000000000 0000000080170017 00000000f5000000 ffff88804ba2fc01
head: 04fff00000000002 ffffea0001098701 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x52810(GFP_NOWAIT|__GFP_RECLAIMABLE|__GFP_NORETRY|__GFP_COMP), pid 20912, tgid 20910 (syz.7.4284), ts 714116691814, free_ts 366964682186
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
kmem_cache_alloc_lru_noprof+0xf4/0x3b0 mm/slub.c:4216
xas_alloc+0x34f/0x460 lib/xarray.c:378
xas_create+0x72b/0x1460 lib/xarray.c:685
xas_store+0x90/0x1910 lib/xarray.c:795
shmem_add_to_page_cache+0x662/0x9a0 mm/shmem.c:910
shmem_alloc_and_add_folio+0x668/0xc20 mm/shmem.c:1916
shmem_get_folio_gfp+0x67f/0x1600 mm/shmem.c:2536
shmem_fault+0x1fe/0xa30 mm/shmem.c:2737
__do_fault+0x10d/0x490 mm/memory.c:5169
page last free pid 12921 tgid 12921 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x1d4/0x510 mm/slub.c:4340
kmalloc_noprof include/linux/slab.h:909 [inline]
tomoyo_realpath_from_path+0xc2/0x6e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x274/0x460 security/tomoyo/file.c:822
security_inode_getattr+0x116/0x290 security/security.c:2377
vfs_getattr fs/stat.c:259 [inline]
vfs_fstat+0x4b/0xe0 fs/stat.c:281
__do_sys_newfstat+0x87/0x100 fs/stat.c:555
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88804261ca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88804261ca80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804261cb00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804261cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804261cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi