================================================================== BUG: KASAN: use-after-free in crc_itu_t+0xd7/0xe0 lib/crc-itu-t.c:60 Read of size 1 at addr ffff8880765a7000 by task syz-executor327/5043 CPU: 1 PID: 5043 Comm: syz-executor327 Not tainted 6.5.0-next-20230831-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 crc_itu_t+0xd7/0xe0 lib/crc-itu-t.c:60 udf_finalize_lvid+0xf2/0x1f0 fs/udf/super.c:1984 udf_sync_fs+0xea/0x150 fs/udf/super.c:2340 sync_filesystem fs/sync.c:56 [inline] sync_filesystem+0x109/0x280 fs/sync.c:30 generic_shutdown_super+0x7e/0x3c0 fs/super.c:666 kill_block_super+0x3b/0x70 fs/super.c:1620 deactivate_locked_super+0x9a/0x170 fs/super.c:481 deactivate_super+0xde/0x100 fs/super.c:514 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254 task_work_run+0x14d/0x240 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f27113ac607 Code: 09 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe166a35e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000018c92 RCX: 00007f27113ac607 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffe166a36a0 RBP: 00007ffe166a36a0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffe166a4710 R13: 00005555566ec6c0 R14: 431bde82d7b634db R15: 00007ffe166a4730 The buggy address belongs to the physical page: page:ffffea0001d969c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x765a7 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea00004abd48 ffffea0001dadb08 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5037, tgid 5037 (sh), ts 95671057152, free_ts 95869175611 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530 prep_new_page mm/page_alloc.c:1537 [inline] get_page_from_freelist+0xf17/0x2e50 mm/page_alloc.c:3200 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4456 __folio_alloc+0x16/0x40 mm/page_alloc.c:4488 vma_alloc_folio+0x156/0x890 mm/mempolicy.c:2259 do_anonymous_page mm/memory.c:4113 [inline] do_pte_missing mm/memory.c:3670 [inline] handle_pte_fault mm/memory.c:4981 [inline] __handle_mm_fault+0xe6c/0x3e20 mm/memory.c:5122 handle_mm_fault+0x47a/0xa00 mm/memory.c:5287 faultin_page mm/gup.c:956 [inline] __get_user_pages+0x4b3/0x1410 mm/gup.c:1239 __get_user_pages_locked mm/gup.c:1504 [inline] get_user_pages_remote+0x23a/0x9d0 mm/gup.c:2337 get_arg_page+0x13f/0x710 fs/exec.c:225 copy_string_kernel+0x1a2/0x240 fs/exec.c:643 do_execveat_common.isra.0+0x426/0x740 fs/exec.c:1938 do_execve fs/exec.c:2038 [inline] __do_sys_execve fs/exec.c:2114 [inline] __se_sys_execve fs/exec.c:2109 [inline] __x64_sys_execve+0x8c/0xb0 fs/exec.c:2109 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1130 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2342 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2481 release_pages+0x32a/0x14e0 mm/swap.c:1042 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:98 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu mm/mmu_gather.c:300 [inline] tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:392 exit_mmap+0x38b/0xa60 mm/mmap.c:3223 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b4/0x2a20 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880765a6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880765a6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880765a7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880765a7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880765a7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================