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BUG: KASAN: use-after-free in fuse_copy_do+0x193/0x380 fs/fuse/dev.c:-1
Write of size 2 at addr ffff88804959afff by task syz.4.3591/17393

CPU: 0 UID: 0 PID: 17393 Comm: syz.4.3591 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 fuse_copy_do+0x193/0x380 fs/fuse/dev.c:-1
 fuse_copy_folio+0xefc/0x1b00 fs/fuse/dev.c:1166
 fuse_notify_store fs/fuse/dev.c:1821 [inline]
 fuse_notify fs/fuse/dev.c:2109 [inline]
 fuse_dev_do_write+0x2b9d/0x4060 fs/fuse/dev.c:2205
 fuse_dev_write+0x177/0x220 fs/fuse/dev.c:2289
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff13c19c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff13cfdd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff13c415fa0 RCX: 00007ff13c19c799
RDX: 000000000000002a RSI: 0000200000000080 RDI: 0000000000000006
RBP: 00007ff13c232bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff13c416038 R14: 00007ff13c415fa0 R15: 00007ffcb3df04e8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:3 mapcount:0 mapping:ffff88806b4d2520 index:0x7 pfn:0x4959a
memcg:ffff8880203e5800
aops:empty_aops ino:1 dentry name(?):"/"
flags: 0xfff00000000005(locked|referenced|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000005 0000000000000000 dead000000000122 ffff88806b4d2520
raw: 0000000000000007 0000000000000000 00000003ffffffff ffff8880203e5800
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 17393, tgid 17392 (syz.4.3591), ts 749936515176, free_ts 749832267602
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1892
 prep_new_page mm/page_alloc.c:1900 [inline]
 get_page_from_freelist+0x23a1/0x2440 mm/page_alloc.c:3965
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5253
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2484
 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline]
 alloc_pages_noprof+0xa8/0x190 mm/mempolicy.c:2575
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2585
 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013
 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2011
 __filemap_get_folio include/linux/pagemap.h:774 [inline]
 filemap_grab_folio include/linux/pagemap.h:854 [inline]
 fuse_notify_store fs/fuse/dev.c:1813 [inline]
 fuse_notify fs/fuse/dev.c:2109 [inline]
 fuse_dev_do_write+0x298b/0x4060 fs/fuse/dev.c:2205
 fuse_dev_write+0x177/0x220 fs/fuse/dev.c:2289
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 17389 tgid 17388 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1436 [inline]
 free_unref_folios+0xd71/0x1530 mm/page_alloc.c:3043
 folios_put_refs+0x9ff/0xb40 mm/swap.c:1008
 free_pages_and_swap_cache+0x2e7/0x5b0 mm/swap_state.c:401
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:417 [inline]
 tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:424
 zap_pte_range mm/memory.c:1955 [inline]
 zap_pmd_range mm/memory.c:2002 [inline]
 zap_pud_range mm/memory.c:2030 [inline]
 zap_p4d_range mm/memory.c:2051 [inline]
 unmap_page_range+0x3cc8/0x4930 mm/memory.c:2072
 unmap_single_vma mm/memory.c:2114 [inline]
 unmap_vmas+0x48f/0x6a0 mm/memory.c:2152
 exit_mmap+0x280/0xa10 mm/mmap.c:1302
 __mmput+0x118/0x430 kernel/fork.c:1179
 exit_mm+0x18e/0x250 kernel/exit.c:581
 do_exit+0x8b9/0x2580 kernel/exit.c:962
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
 get_signal+0x1284/0x1330 kernel/signal.c:3032
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804959af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804959af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804959b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88804959b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804959b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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