================================================================== BUG: KASAN: use-after-free in crc_itu_t+0xd2/0xe0 lib/crc-itu-t.c:60 Read of size 1 at addr ffff88805a1da000 by task syz-executor.2/5638 CPU: 1 PID: 5638 Comm: syz-executor.2 Not tainted 6.4.0-rc4-syzkaller-00031-g8b817fded42d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 crc_itu_t+0xd2/0xe0 lib/crc-itu-t.c:60 udf_finalize_lvid+0xe0/0x1d0 fs/udf/super.c:1988 udf_sync_fs+0xea/0x150 fs/udf/super.c:2344 sync_filesystem.part.0+0x75/0x1d0 fs/sync.c:56 sync_filesystem+0x8f/0xc0 fs/sync.c:43 generic_shutdown_super+0x74/0x480 fs/super.c:473 kill_block_super+0xa1/0x100 fs/super.c:1407 deactivate_locked_super+0x98/0x160 fs/super.c:331 deactivate_super+0xb1/0xd0 fs/super.c:362 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xad3/0x2960 kernel/exit.c:871 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 get_signal+0x2315/0x25b0 kernel/signal.c:2874 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:301 RIP: 0033:0x7fbe6488c169 Code: Unable to access opcode bytes at 0x7fbe6488c13f. RSP: 002b:00007fbe655e2118 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: 0000000000000000 RBX: 00007fbe649abf80 RCX: 00007fbe6488c169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbe648e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff34720e4f R14: 00007fbe655e2300 R15: 0000000000022000 The buggy address belongs to the physical page: page:ffffea0001687680 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x5a1da flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffff7f(buddy) raw: 00fff00000000000 ffffea0001162508 ffffea000109bf08 0000000000000000 raw: 0000000000000001 0000000000000001 00000000ffffff7f 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 5308, tgid 4986 (syz-fuzzer), ts 1244562199578, free_ts 1701178653095 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 __folio_alloc+0x16/0x40 mm/page_alloc.c:4800 vma_alloc_folio+0x155/0x890 mm/mempolicy.c:2240 do_anonymous_page mm/memory.c:4085 [inline] do_pte_missing mm/memory.c:3645 [inline] handle_pte_fault mm/memory.c:4947 [inline] __handle_mm_fault+0x224c/0x41c0 mm/memory.c:5089 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243 do_user_addr_fault+0x2ca/0x1210 arch/x86/mm/fault.c:1349 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2705 release_pages+0xcd8/0x1380 mm/swap.c:1042 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391 zap_page_range_single+0x347/0x4a0 mm/memory.c:1756 madvise_dontneed_single_vma mm/madvise.c:803 [inline] madvise_dontneed_free mm/madvise.c:884 [inline] madvise_vma_behavior+0x1356/0x20a0 mm/madvise.c:1023 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1248 do_madvise.part.0+0x274/0x5c0 mm/madvise.c:1428 do_madvise mm/madvise.c:1441 [inline] __do_sys_madvise mm/madvise.c:1441 [inline] __se_sys_madvise mm/madvise.c:1439 [inline] __x64_sys_madvise+0x117/0x150 mm/madvise.c:1439 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88805a1d9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805a1d9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805a1da000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805a1da080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805a1da100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================