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BUG: KASAN: use-after-free in __vma_adjust+0x18ee/0x1900 mm/mmap.c:766
Read of size 8 at addr ffff88807dd1d9a0 by task syz-executor.4/8597

CPU: 0 PID: 8597 Comm: syz-executor.4 Not tainted 5.19.0-rc3-next-20220624-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:317 [inline]
 print_report.cold+0x2ba/0x726 mm/kasan/report.c:433
 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495
 __vma_adjust+0x18ee/0x1900 mm/mmap.c:766
 vma_merge+0x590/0x870 mm/mmap.c:1122
 userfaultfd_release+0x4c5/0x690 fs/userfaultfd.c:884
 __fput+0x277/0x9d0 fs/file_table.c:317
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f0000c89109
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0001d4b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: 0000000000000020 RBX: 00007f0000d9bf60 RCX: 00007f0000c89109
RDX: 000000000000003c RSI: 0000000020000180 RDI: 0000000000000005
RBP: 00007f0001d4b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff01f00b6f R14: 00007f0001d4b300 R15: 0000000000022000
 </TASK>

Allocated by task 3634:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:736 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x280/0x4d0 mm/slub.c:3268
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 dup_mmap+0x656/0x1090 kernel/fork.c:640
 dup_mm+0x91/0x370 kernel/fork.c:1520
 copy_mm kernel/fork.c:1569 [inline]
 copy_process+0x3ca8/0x7080 kernel/fork.c:2237
 kernel_clone+0xe7/0xab0 kernel/fork.c:2652
 __do_sys_clone+0xba/0x100 kernel/fork.c:2786
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 8597:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1754 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
 slab_free mm/slub.c:3534 [inline]
 kmem_cache_free+0xed/0x5b0 mm/slub.c:3551
 __vma_adjust+0x9ab/0x1900 mm/mmap.c:889
 vma_merge+0x590/0x870 mm/mmap.c:1122
 userfaultfd_release+0x4c5/0x690 fs/userfaultfd.c:884
 __fput+0x277/0x9d0 fs/file_table.c:317
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff88807dd1d948
 which belongs to the cache vm_area_struct of size 152
The buggy address is located 88 bytes inside of
 152-byte region [ffff88807dd1d948, ffff88807dd1d9e0)

The buggy address belongs to the physical page:
page:ffffea0001f74740 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807dd1d870 pfn:0x7dd1d
memcg:ffff88802963a301
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00005a9c88 ffffea00019f2148 ffff888140006b40
raw: ffff88807dd1d870 0000000000120010 00000001ffffffff ffff88802963a301
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3631, tgid 3631 (syz-executor.0), ts 342375681834, free_ts 342186702671
 prep_new_page mm/page_alloc.c:2535 [inline]
 get_page_from_freelist+0x1f18/0x3a40 mm/page_alloc.c:4306
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5522
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x99f/0xe10 mm/slub.c:3031
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x3e6/0x4d0 mm/slub.c:3268
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 dup_mmap+0x656/0x1090 kernel/fork.c:640
 dup_mm+0x91/0x370 kernel/fork.c:1520
 copy_mm kernel/fork.c:1569 [inline]
 copy_process+0x3ca8/0x7080 kernel/fork.c:2237
 kernel_clone+0xe7/0xab0 kernel/fork.c:2652
 __do_sys_clone+0xba/0x100 kernel/fork.c:2786
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1453 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1503
 free_unref_page_prepare mm/page_alloc.c:3383 [inline]
 free_unref_page+0x19/0x580 mm/page_alloc.c:3480
 __vunmap+0x86b/0xd50 mm/vmalloc.c:2695
 free_work+0x58/0x70 mm/vmalloc.c:97
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302

Memory state around the buggy address:
 ffff88807dd1d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807dd1d900: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
>ffff88807dd1d980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                               ^
 ffff88807dd1da00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807dd1da80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fb
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