UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
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BUG: KASAN: use-after-free in udf_write_aext+0x62d/0x7e0 fs/udf/inode.c:2088
Write of size 4 at addr ffff888078157ff0 by task syz-executor.4/25549

CPU: 0 PID: 25549 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-00020-g7bf70dbb1882 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:306
 print_report+0x107/0x1f0 mm/kasan/report.c:417
 kasan_report+0xcd/0x100 mm/kasan/report.c:517
 udf_write_aext+0x62d/0x7e0 fs/udf/inode.c:2088
 udf_add_entry+0x1712/0x3300 fs/udf/namei.c:482
 udf_mkdir+0x13c/0x980 fs/udf/namei.c:681
 vfs_mkdir+0x3b3/0x590 fs/namei.c:4036
 do_mkdirat+0x25b/0x530 fs/namei.c:4061
 __do_sys_mkdir fs/namei.c:4081 [inline]
 __se_sys_mkdir fs/namei.c:4079 [inline]
 __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4079
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f66e4e8c0c9
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:00007f66e5c7d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f66e4fabf80 RCX: 00007f66e4e8c0c9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000000
RBP: 00007f66e4ee7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc444d19af R14: 00007f66e5c7d300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001e055c0 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x78157
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001d5d1c8 ffffea0000756988 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT), pid 25185, tgid 25185 (syz-executor.4), ts 982568089035, free_ts 982681787058
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
 pte_alloc_one+0x7f/0x320 arch/x86/mm/pgtable.c:33
 __pte_alloc+0x75/0x220 mm/memory.c:421
 do_anonymous_page+0xda9/0x10b0 mm/memory.c:4042
 handle_pte_fault mm/memory.c:4929 [inline]
 __handle_mm_fault mm/memory.c:5073 [inline]
 handle_mm_fault+0x1610/0x26b0 mm/memory.c:5219
 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428
 handle_page_fault arch/x86/mm/fault.c:1519 [inline]
 exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575
 asm_exc_page_fault+0x22/0x30 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:1446 [inline]
 free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page_list+0xb2/0x830 mm/page_alloc.c:3510
 release_pages+0x233e/0x25e0 mm/swap.c:1076
 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu+0x860/0xa80 mm/mmu_gather.c:299
 tlb_finish_mmu+0xcd/0x200 mm/mmu_gather.c:391
 exit_mmap+0x275/0x630 mm/mmap.c:3100
 __mmput+0x114/0x3b0 kernel/fork.c:1207
 exit_mm+0x1ec/0x2c0 kernel/exit.c:563
 do_exit+0x5c7/0x2150 kernel/exit.c:854
 do_group_exit+0x1fd/0x2b0 kernel/exit.c:1012
 get_signal+0x1701/0x17c0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x7b/0x5e0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x74/0x150 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86

Memory state around the buggy address:
 ffff888078157e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888078157f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888078157f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff888078158000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888078158080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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