==================================================================
BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:721 [inline]
BUG: KASAN: use-after-free in mas_next_nentry+0x9e4/0xab0 lib/maple_tree.c:4662
Read of size 8 at addr ffff888021853020 by task syz-executor.5/4403
CPU: 1 PID: 4403 Comm: syz-executor.5 Not tainted 6.1.0-rc1-syzkaller-00134-ge35184f32151 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:395
kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
mas_safe_min lib/maple_tree.c:721 [inline]
mas_next_nentry+0x9e4/0xab0 lib/maple_tree.c:4662
mas_next_entry lib/maple_tree.c:4757 [inline]
mas_next+0x1fb/0xc90 lib/maple_tree.c:5868
userfaultfd_unregister fs/userfaultfd.c:1657 [inline]
userfaultfd_ioctl+0x33c3/0x4200 fs/userfaultfd.c:2005
compat_ptr_ioctl+0x67/0x90 fs/ioctl.c:906
__do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7f2d549
Code: 03 74 c0 01 10 05 03 74 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 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:00000000f7f285cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000008010aa01
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 4403:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x7e/0x80 mm/kasan/common.c:325
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
kmem_cache_alloc_bulk+0x3e9/0x830 mm/slub.c:3854
mt_alloc_bulk lib/maple_tree.c:157 [inline]
mas_alloc_nodes+0x309/0x810 lib/maple_tree.c:1256
mas_node_count_gfp lib/maple_tree.c:1316 [inline]
mas_preallocate+0x1b7/0x360 lib/maple_tree.c:5719
__vma_adjust+0x181/0x1a70 mm/mmap.c:715
vma_adjust include/linux/mm.h:2663 [inline]
__split_vma+0x295/0x5c0 mm/mmap.c:2239
split_vma+0x9f/0xe0 mm/mmap.c:2272
userfaultfd_register fs/userfaultfd.c:1454 [inline]
userfaultfd_ioctl+0x3a8c/0x4200 fs/userfaultfd.c:2002
compat_ptr_ioctl+0x67/0x90 fs/ioctl.c:906
__do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
Freed by task 4403:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
kmem_cache_free_bulk.part.0+0x205/0x780 mm/slub.c:3779
mt_free_bulk lib/maple_tree.c:163 [inline]
mas_destroy+0x394/0x5c0 lib/maple_tree.c:5769
mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5704
__vma_adjust+0x765/0x1a70 mm/mmap.c:810
vma_adjust include/linux/mm.h:2663 [inline]
__split_vma+0x295/0x5c0 mm/mmap.c:2239
split_vma+0x9f/0xe0 mm/mmap.c:2272
userfaultfd_unregister fs/userfaultfd.c:1641 [inline]
userfaultfd_ioctl+0x3819/0x4200 fs/userfaultfd.c:2005
compat_ptr_ioctl+0x67/0x90 fs/ioctl.c:906
__do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
The buggy address belongs to the object at ffff888021853000
which belongs to the cache maple_node of size 256
The buggy address is located 32 bytes inside of
256-byte region [ffff888021853000, ffff888021853100)
The buggy address belongs to the physical page:
page:ffffea0000861480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21852
head:ffffea0000861480 order:1 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801184fdc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4403, tgid 4401 (syz-executor.5), ts 97946155933, free_ts 83923291228
prep_new_page mm/page_alloc.c:2538 [inline]
get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4287
__alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5554
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
alloc_slab_page mm/slub.c:1794 [inline]
allocate_slab+0x213/0x300 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3180
kmem_cache_alloc_bulk+0x28b/0x830 mm/slub.c:3830
mt_alloc_bulk lib/maple_tree.c:157 [inline]
mas_alloc_nodes+0x309/0x810 lib/maple_tree.c:1256
mas_node_count_gfp lib/maple_tree.c:1316 [inline]
mas_preallocate+0x1b7/0x360 lib/maple_tree.c:5719
__vma_adjust+0x181/0x1a70 mm/mmap.c:715
vma_adjust include/linux/mm.h:2663 [inline]
__split_vma+0x4b0/0x5c0 mm/mmap.c:2236
split_vma+0x9f/0xe0 mm/mmap.c:2272
userfaultfd_register fs/userfaultfd.c:1447 [inline]
userfaultfd_ioctl+0x3a4e/0x4200 fs/userfaultfd.c:2002
compat_ptr_ioctl+0x67/0x90 fs/ioctl.c:906
__do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1458 [inline]
free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
free_unref_page_prepare mm/page_alloc.c:3386 [inline]
free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x2ac/0x3c0 mm/slub.c:3422
ptlock_alloc+0x1d/0x70 mm/memory.c:5842
ptlock_init include/linux/mm.h:2336 [inline]
pgtable_pte_page_ctor include/linux/mm.h:2363 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:66 [inline]
pte_alloc_one+0x68/0x230 arch/x86/mm/pgtable.c:33
__pte_alloc+0x69/0x250 mm/memory.c:468
do_anonymous_page mm/memory.c:4082 [inline]
handle_pte_fault mm/memory.c:4953 [inline]
__handle_mm_fault+0x3527/0x3a40 mm/memory.c:5097
handle_mm_fault+0x1c8/0x780 mm/memory.c:5218
do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
Memory state around the buggy address:
ffff888021852f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888021852f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888021853000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888021853080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888021853100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi
4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d
a: 10 06 adc %al,(%rsi)
c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
10: 10 07 adc %al,(%rdi)
12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
16: 10 08 adc %cl,(%rax)
18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1c: 00 00 add %al,(%rax)
1e: 00 00 add %al,(%rax)
20: 00 51 52 add %dl,0x52(%rcx)
23: 55 push %rbp
24: 89 e5 mov %esp,%ebp
26: 0f 34 sysenter
28: cd 80 int $0x80
* 2a: 5d pop %rbp <-- trapping instruction
2b: 5a pop %rdx
2c: 59 pop %rcx
2d: c3 retq
2e: 90 nop
2f: 90 nop
30: 90 nop
31: 90 nop
32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi