================================================================== BUG: KASAN: use-after-free in crc_itu_t+0x1f9/0x280 lib/crc-itu-t.c:60 Read of size 1 at addr ffff88806d409000 by task syz-executor/5881 CPU: 1 PID: 5881 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 crc_itu_t+0x1f9/0x280 lib/crc-itu-t.c:60 udf_finalize_lvid fs/udf/super.c:2009 [inline] udf_close_lvid+0x547/0x990 fs/udf/super.c:2077 udf_put_super+0xcc/0x160 fs/udf/super.c:2347 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1259 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6326b90a77 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc04d96228 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f6326c13d7d RCX: 00007f6326b90a77 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc04d962e0 RBP: 00007ffc04d962e0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc04d97370 R13: 00007f6326c13d7d R14: 0000000000015ed8 R15: 00007ffc04d973b0 The buggy address belongs to the physical page: page:ffffea0001b50240 refcount:2 mapcount:1 mapping:0000000000000000 index:0x7fc7d595e pfn:0x6d409 memcg:ffff88801a272000 anon flags: 0xfff000000a0108(uptodate|active|mappedtodisk|swapbacked|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x0() raw: 00fff000000a0108 0000000000000000 dead000000000122 ffff888025897aa1 raw: 00000007fc7d595e 0000000000000000 0000000200000000 ffff88801a272000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5891, tgid 5891 (udevd), ts 89962352379, free_ts 89933514614 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 __folio_alloc+0x10/0x20 mm/page_alloc.c:4489 vma_alloc_folio+0x47a/0x8f0 mm/mempolicy.c:2242 do_anonymous_page mm/memory.c:4150 [inline] do_pte_missing mm/memory.c:3687 [inline] handle_pte_fault mm/memory.c:5047 [inline] __handle_mm_fault mm/memory.c:5188 [inline] handle_mm_fault+0x1a38/0x4920 mm/memory.c:5353 do_user_addr_fault+0x738/0x12e0 arch/x86/mm/fault.c:1373 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475 release_pages+0x1fa0/0x2220 mm/swap.c:1022 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x368/0x4f0 mm/mmu_gather.c:300 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:392 unmap_region+0x2ed/0x340 mm/mmap.c:2349 do_vmi_align_munmap+0xffe/0x1660 mm/mmap.c:2592 do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660 __vm_munmap+0x193/0x3c0 mm/mmap.c:2961 __do_sys_munmap mm/mmap.c:2978 [inline] __se_sys_munmap mm/mmap.c:2975 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:2975 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88806d408f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806d408f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88806d409000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88806d409080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806d409100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================