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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 ffff88801fa922b8 by task syz.0.0/5351

CPU: 0 UID: 0 PID: 5351 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_nolock+0x208/0x980 fs/ext4/inline.c:1132
 ext4_convert_inline_data+0x484/0x5c0 fs/ext4/inline.c:2012
 ext4_fallocate+0x1e2/0x400 fs/ext4/extents.c:4979
 vfs_fallocate+0x65a/0x7e0 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xbf/0x110 fs/open.c:365
 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: 0033:0x7f09c139f559
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:00007f09c2295fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f09c1626180 RCX: 00007f09c139f559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f09c1436b20 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f09c1626218 R14: 00007f09c1626180 R15: 00007ffe087f2438
 </TASK>

The buggy address belongs to the physical page:
page: refcount:3 mapcount:0 mapping:ffff88801e025940 index:0x2 pfn:0x1fa92
memcg:ffff888035e37900
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0xfff18000004204(referenced|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff18000004204 0000000000000000 dead000000000122 ffff88801e025940
raw: 0000000000000002 ffff8880443ffa80 00000003ffffffff ffff888035e37900
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 5351, tgid 5344 (syz.0.0), ts 119529384894
 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:864 [inline]
 grow_buffers fs/buffer.c:930 [inline]
 __getblk_slow fs/buffer.c:948 [inline]
 bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1358
 __getblk include/linux/buffer_head.h:442 [inline]
 sb_getblk include/linux/buffer_head.h:448 [inline]
 __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4921
 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:5049
 ext4_convert_inline_data+0x261/0x5c0 fs/ext4/inline.c:2000
 ext4_fallocate+0x1e2/0x400 fs/ext4/extents.c:4979
 vfs_fallocate+0x65a/0x7e0 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xbf/0x110 fs/open.c:365
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
page last free pid 79 tgid 79 ts 116508884530 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
 shrink_folio_list+0x2be2/0x5250 mm/vmscan.c:1511
 evict_folios+0x3055/0x3fb0 mm/vmscan.c:4910
 try_to_shrink_lruvec+0xe3b/0x1340 mm/vmscan.c:5076
 shrink_one+0x233/0x730 mm/vmscan.c:5117
 shrink_many mm/vmscan.c:5180 [inline]
 lru_gen_shrink_node mm/vmscan.c:5258 [inline]
 shrink_node+0x35d0/0x3e30 mm/vmscan.c:6247
 kswapd_shrink_node mm/vmscan.c:7101 [inline]
 balance_pgdat mm/vmscan.c:7279 [inline]
 kswapd+0x185e/0x32c0 mm/vmscan.c:7555
 kthread+0x38b/0x480 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:
 ffff88801fa92180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801fa92200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801fa92280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff88801fa92300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801fa92380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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