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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1763
Read of size 18446744073709551600 at addr ffff8880427455d0 by task syz.0.0/5328

CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1763
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2275
 ext4_destroy_inline_data_nolock+0x23a/0x5e0 fs/ext4/inline.c:472
 ext4_convert_inline_data_to_extent+0x547/0xde0 fs/ext4/inline.c:631
 ext4_write_begin+0x357/0x1890 fs/ext4/inode.c:1315
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325
 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:316
 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1
 aio_write+0x5cd/0x870 fs/aio.c:1688
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x7bb/0x14c0 fs/aio.c:2107
 __do_sys_io_submit fs/aio.c:2166 [inline]
 __se_sys_io_submit+0x195/0x340 fs/aio.c:2136
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f566099ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f566187afe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f5660c16090 RCX: 00007f566099ce59
RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f5661852000
RBP: 00007f5660a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5660c16128 R14: 00007f5660c16090 R15: 00007ffcdea73ba8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:ffff88801cc25940 index:0x2 pfn:0x42745
memcg:ffff88801c2c4700
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff58000004224(referenced|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff58000004224 ffffea0001436a08 ffff888030448240 ffff88801cc25940
raw: 0000000000000002 ffff888046fbb828 00000002ffffffff ffff88801c2c4700
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x42800(GFP_NOWAIT|__GFP_COMP), pid 12, tgid 12 (kworker/u4:0), ts 103311462984, free_ts 103304312310
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
 alloc_pages_mpol+0x235/0x490 mm/mempolicy.c:2490
 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline]
 alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591
 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1014
 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2012
 __filemap_get_folio include/linux/pagemap.h:763 [inline]
 grow_dev_folio fs/buffer.c:954 [inline]
 grow_buffers fs/buffer.c:1020 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1358
 ext4_sb_breadahead_unmovable+0x6f/0xf0 fs/ext4/super.c:280
 __ext4_get_inode_loc+0xae3/0xfa0 fs/ext4/inode.c:4973
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:5003 [inline]
 ext4_write_inode+0x311/0x620 fs/ext4/inode.c:5791
 write_inode fs/fs-writeback.c:1584 [inline]
 __writeback_single_inode+0x75a/0x10e0 fs/fs-writeback.c:1827
 writeback_sb_inodes+0x979/0x19d0 fs/fs-writeback.c:2056
 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2132
 wb_writeback+0x459/0xb00 fs/fs-writeback.c:2243
page last free pid 15 tgid 15 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888042745480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888042745500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888042745580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888042745600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888042745680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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