================================================================== BUG: KASAN: use-after-free in crc_itu_t+0xd2/0xe0 lib/crc-itu-t.c:60 Read of size 1 at addr ffff888050554000 by task syz-executor.2/27463 CPU: 1 PID: 27463 Comm: syz-executor.2 Not tainted 6.3.0-rc4-syzkaller-00161-g62bad54b26db #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 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:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 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_fs_one_sb fs/sync.c:84 [inline] sync_fs_one_sb+0x10b/0x150 fs/sync.c:80 iterate_supers+0x140/0x2a0 fs/super.c:745 ksys_sync+0x9b/0x150 fs/sync.c:103 __do_sys_sync+0xe/0x20 fs/sync.c:113 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 RIP: 0033:0x7fb94328c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007fb941b9b168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fb9433ac1f0 RCX: 00007fb94328c0f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fb9432e7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe95aca75f R14: 00007fb941b9b300 R15: 0000000000022000 The buggy address belongs to the physical page: page:ffffea0001415500 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x50554 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0002634808 ffffea0001856608 0000000000000000 raw: 0000000000000001 0000000000000002 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 27087, tgid 27086 (syz-executor.2), ts 2779756316420, free_ts 2780022776299 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592 __folio_alloc+0x16/0x40 mm/page_alloc.c:5624 vma_alloc_folio+0x155/0x880 mm/mempolicy.c:2244 wp_page_copy mm/memory.c:3064 [inline] do_wp_page+0x178e/0x3610 mm/memory.c:3426 handle_pte_fault mm/memory.c:4927 [inline] __handle_mm_fault+0x19a1/0x3e60 mm/memory.c:5051 handle_mm_fault+0x2ba/0x9c0 mm/memory.c:5197 do_user_addr_fault+0x475/0x1230 arch/x86/mm/fault.c:1407 handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1554 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:1454 [inline] free_pcp_prepare+0x5d5/0xa50 mm/page_alloc.c:1504 free_unref_page_prepare mm/page_alloc.c:3388 [inline] free_unref_page_list+0x176/0xbc0 mm/page_alloc.c:3529 release_pages+0xcd7/0x1380 mm/swap.c:1042 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 zap_pte_range mm/memory.c:1487 [inline] zap_pmd_range mm/memory.c:1536 [inline] zap_pud_range mm/memory.c:1565 [inline] zap_p4d_range mm/memory.c:1586 [inline] unmap_page_range+0x2605/0x3ce0 mm/memory.c:1607 unmap_single_vma+0x194/0x2a0 mm/memory.c:1653 unmap_vmas+0x234/0x380 mm/memory.c:1692 exit_mmap+0x190/0x690 mm/mmap.c:3031 __mmput+0x128/0x4c0 kernel/fork.c:1204 mmput+0x60/0x70 kernel/fork.c:1226 exit_mm kernel/exit.c:563 [inline] do_exit+0x9d7/0x2960 kernel/exit.c:856 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019 get_signal+0x2315/0x25b0 kernel/signal.c:2859 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 Memory state around the buggy address: ffff888050553f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888050553f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888050554000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888050554080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888050554100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================