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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1767
Read of size 18446744073709551600 at addr ffff888053d13cb8 by task syz.0.0/5319

CPU: 0 UID: 0 PID: 5319 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+0x92b/0x1ed0 fs/ext4/xattr.c:1767
 ext4_xattr_ibody_set+0x262/0x710 fs/ext4/xattr.c:2277
 ext4_destroy_inline_data_nolock+0x23a/0x5f0 fs/ext4/inline.c:471
 ext4_convert_inline_data_to_extent+0x549/0xde0 fs/ext4/inline.c:630
 ext4_write_begin+0x3bd/0x1900 fs/ext4/inode.c:1306
 ext4_da_write_begin+0x46a/0xd70 fs/ext4/inode.c:3142
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4374
 ext4_buffered_write_iter+0xd4/0x380 fs/ext4/file.c:354
 ext4_file_write_iter+0xae4/0x1cd0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd82a59e159
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:00007fd82b4a3fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd82a826090 RCX: 00007fd82a59e159
RDX: 0000000000002400 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007fd82a635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd82a826128 R14: 00007fd82a826090 R15: 00007fff50d0e168
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:ffff88801d025940 index:0x5 pfn:0x53d13
memcg:ffff888012a79980
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff58000004234(referenced|dirty|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff58000004234 ffffea00014f6d08 ffffea0001426588 ffff88801d025940
raw: 0000000000000005 ffff8880441a77e0 00000002ffffffff ffff888012a79980
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5319, tgid 5317 (syz.0.0), ts 94734082937
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2577
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2587
 filemap_alloc_folio_noprof+0x111/0x460 mm/filemap.c:1019
 __filemap_get_folio_mpol+0x402/0x1000 mm/filemap.c:2018
 __filemap_get_folio include/linux/pagemap.h:761 [inline]
 grow_dev_folio fs/buffer.c:858 [inline]
 grow_buffers fs/buffer.c:924 [inline]
 __getblk_slow fs/buffer.c:942 [inline]
 bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1346
 __getblk include/linux/buffer_head.h:378 [inline]
 sb_getblk include/linux/buffer_head.h:384 [inline]
 __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4921
 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:5049
 ext4_xattr_ibody_get+0x113/0x4b0 fs/ext4/xattr.c:659
 ext4_xattr_get+0x121/0x690 fs/ext4/xattr.c:720
 __vfs_getxattr+0x412/0x440 fs/xattr.c:446
 cap_inode_need_killpriv+0x45/0x60 security/commoncap.c:331
 security_inode_need_killpriv+0x85/0x240 security/security.c:2186
page last free pid 5318 tgid 5317 ts 94624758052 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 free_unref_folios+0xdc2/0x14e0 mm/page_alloc.c:3022
 folios_put_refs+0x9e9/0xb30 mm/folio.c:1034
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x4e6/0x15d0 mm/shmem.c:1161
 shmem_truncate_range mm/shmem.c:1289 [inline]
 shmem_evict_inode+0x247/0xae0 mm/shmem.c:1420
 evict+0x624/0xb50 fs/inode.c:822
 dentry_kill+0x1b9/0x880 fs/dcache.c:826
 finish_dput+0x1a/0x260 fs/dcache.c:1001
 __fput+0x675/0xa50 fs/file_table.c:520
 fput_close_sync+0x11f/0x240 fs/file_table.c:617
 __do_sys_close fs/open.c:1560 [inline]
 __se_sys_close fs/open.c:1545 [inline]
 __x64_sys_close+0x7e/0x110 fs/open.c:1545
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888053d13b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888053d13c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888053d13c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff888053d13d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888053d13d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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