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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763
Read of size 18446744073709551600 at addr ffff88804d352ec8 by task syz.0.0/5331

CPU: 0 UID: 0 PID: 5331 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:1763
 ext4_xattr_ibody_set+0x262/0x710 fs/ext4/xattr.c:2275
 ext4_destroy_inline_data_nolock+0x23a/0x5f0 fs/ext4/inline.c:472
 ext4_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1806
 ext4_do_writepages+0x573/0x47a0 fs/ext4/inode.c:2828
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043
 do_writepages+0x338/0x560 mm/page-writeback.c:2571
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_flush_range mm/filemap.c:436 [inline]
 filemap_flush+0x1e1/0x2e0 mm/filemap.c:451
 ext4_release_file+0x82/0x310 fs/ext4/file.c:169
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f4119ce59
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:00007fff5c42cfd8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff5c42d0c0 RCX: 00007f2f4119ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001a935 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f2f40fff02c R11: 0000000000000246 R12: 00007fff5c42d100
R13: 00007f2f4141609c R14: 000000000001abbb R15: 00007f2f41416090
 </TASK>

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:ffff88801cc25940 index:0x2 pfn:0x4d352
memcg:ffff888038211980
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff58000004024(referenced|lru|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff58000004024 ffff888030448a80 ffff888030448a80 ffff88801cc25940
raw: 0000000000000002 ffff888043e43e00 00000002ffffffff ffff888038211980
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 5331, tgid 5331 (syz.0.0), ts 109648748144, free_ts 109579606098
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_pages_mpol+0x212/0x380 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:1013
 __filemap_get_folio_mpol+0x402/0x1000 mm/filemap.c:2012
 __filemap_get_folio include/linux/pagemap.h:761 [inline]
 grow_dev_folio fs/buffer.c:960 [inline]
 grow_buffers fs/buffer.c:1026 [inline]
 __getblk_slow fs/buffer.c:1044 [inline]
 bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1439
 __getblk include/linux/buffer_head.h:382 [inline]
 sb_getblk include/linux/buffer_head.h:388 [inline]
 __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4891
 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:5019
 ext4_destroy_inline_data_nolock+0x140/0x5f0 fs/ext4/inline.c:456
 ext4_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1806
 ext4_do_writepages+0x573/0x47a0 fs/ext4/inode.c:2828
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043
 do_writepages+0x338/0x560 mm/page-writeback.c:2571
page last free pid 5332 tgid 5331 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xd84/0x14a0 mm/page_alloc.c:3011
 folios_put_refs+0x9e9/0xb30 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 mapping_try_invalidate+0x3b7/0x4b0 mm/truncate.c:579
 loop_set_status+0x25d/0xd50 drivers/block/loop.c:1242
 loop_set_status_old drivers/block/loop.c:1358 [inline]
 lo_ioctl+0xcd9/0x1fc0 drivers/block/loop.c:1547
 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:797
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d352d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804d352e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804d352e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                              ^
 ffff88804d352f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804d352f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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