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BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:721 [inline]
BUG: KASAN: use-after-free in mas_next_nentry lib/maple_tree.c:4662 [inline]
BUG: KASAN: use-after-free in mas_next_entry+0x344/0x10f0 lib/maple_tree.c:4757
Read of size 8 at addr ffff888023786e20 by task syz-executor.2/30318

CPU: 1 PID: 30318 Comm: syz-executor.2 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #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+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:284
 print_report+0x107/0x220 mm/kasan/report.c:395
 kasan_report+0x139/0x170 mm/kasan/report.c:495
 mas_safe_min lib/maple_tree.c:721 [inline]
 mas_next_nentry lib/maple_tree.c:4662 [inline]
 mas_next_entry+0x344/0x10f0 lib/maple_tree.c:4757
 userfaultfd_unregister+0x1240/0x13b0 fs/userfaultfd.c:1657
 userfaultfd_ioctl+0x5a1/0x3230 fs/userfaultfd.c:2005
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa2bc68b5a9
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:00007fa2bb9de168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa2bc7ac120 RCX: 00007fa2bc68b5a9
RDX: 00000000200000c0 RSI: 000000008010aa01 RDI: 0000000000000004
RBP: 00007fa2bc6e67b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff42eb1a6f R14: 00007fa2bb9de300 R15: 0000000000022000
 </TASK>

Allocated by task 30293:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 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+0x43d/0x580 mm/slub.c:3854
 mt_alloc_bulk lib/maple_tree.c:157 [inline]
 mas_alloc_nodes+0x386/0x650 lib/maple_tree.c:1256
 mas_node_count_gfp lib/maple_tree.c:1316 [inline]
 mas_preallocate+0x133/0x340 lib/maple_tree.c:5719
 __vma_adjust+0x886/0x2120 mm/mmap.c:716
 __split_vma+0x374/0x4f0
 mprotect_fixup+0x538/0x820 mm/mprotect.c:617
 do_mprotect_pkey+0x7fc/0xb20 mm/mprotect.c:792
 __do_sys_mprotect mm/mprotect.c:819 [inline]
 __se_sys_mprotect mm/mprotect.c:816 [inline]
 __x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:816
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 30318:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750
 slab_free mm/slub.c:3661 [inline]
 kmem_cache_free_bulk+0x137/0x1a0 mm/slub.c:3779
 mt_free_bulk lib/maple_tree.c:163 [inline]
 mas_destroy+0x2d02/0x37b0 lib/maple_tree.c:5769
 mas_store_prealloc+0x35d/0x450 lib/maple_tree.c:5704
 vma_mas_store mm/mmap.c:435 [inline]
 __vma_adjust+0x162e/0x2120 mm/mmap.c:784
 __split_vma+0x374/0x4f0
 userfaultfd_unregister+0x1131/0x13b0 fs/userfaultfd.c:1636
 userfaultfd_ioctl+0x5a1/0x3230 fs/userfaultfd.c:2005
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888023786e00
 which belongs to the cache maple_node of size 256
The buggy address is located 32 bytes inside of
 256-byte region [ffff888023786e00, ffff888023786f00)

The buggy address belongs to the physical page:
page:ffffea00008de180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23786
head:ffffea00008de180 order:1 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001dafb00 dead000000000003 ffff88801204fdc0
raw: 0000000000000000 0000000080100010 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 15192, tgid 15192 (modprobe), ts 561003101101, free_ts 522344423705
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4287
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5554
 alloc_slab_page+0x70/0xf0 mm/slub.c:1794
 allocate_slab+0x5e/0x4b0 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3180
 kmem_cache_alloc_bulk+0x1f1/0x580 mm/slub.c:3830
 mt_alloc_bulk lib/maple_tree.c:157 [inline]
 mas_alloc_nodes+0x386/0x650 lib/maple_tree.c:1256
 mas_node_count_gfp lib/maple_tree.c:1316 [inline]
 mas_preallocate+0x133/0x340 lib/maple_tree.c:5719
 expand_downwards+0x374/0xe70 mm/mmap.c:2022
 setup_arg_pages+0x8c4/0xbe0 fs/exec.c:857
 load_elf_binary+0xbf0/0x2860 fs/binfmt_elf.c:1019
 search_binary_handler fs/exec.c:1727 [inline]
 exec_binprm fs/exec.c:1768 [inline]
 bprm_execve+0x8dc/0x1590 fs/exec.c:1837
 kernel_execve+0x8eb/0xa00 fs/exec.c:2002
 call_usermodehelper_exec_async+0x262/0x3b0 kernel/umh.c:113
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
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+0x80c/0x8f0 mm/page_alloc.c:1508
 free_unref_page_prepare mm/page_alloc.c:3386 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3482
 relay_destroy_buf+0x119/0x3b0 kernel/relay.c:201
 relay_remove_buf kernel/relay.c:221 [inline]
 kref_put include/linux/kref.h:65 [inline]
 relay_close_buf kernel/relay.c:430 [inline]
 relay_close+0x3dc/0x710 kernel/relay.c:766
 blk_trace_free+0x3c/0x120 kernel/trace/blktrace.c:316
 blk_trace_cleanup kernel/trace/blktrace.c:384 [inline]
 __blk_trace_remove+0x222/0x2b0 kernel/trace/blktrace.c:397
 blk_trace_ioctl+0x20b/0x8f0 kernel/trace/blktrace.c:760
 blkdev_common_ioctl+0xf2e/0x2350 block/ioctl.c:534
 blkdev_ioctl+0x2f2/0x760 block/ioctl.c:608
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888023786d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888023786d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888023786e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888023786e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023786f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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