==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xa87/0x1fa0 fs/ext4/xattr.c:1710
Read of size 18446744073709551552 at addr ffff88807225a2e8 by task syz.0.581/7485

CPU: 0 PID: 7485 Comm: syz.0.581 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:427
 kasan_report+0x136/0x160 mm/kasan/report.c:531
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0xa87/0x1fa0 fs/ext4/xattr.c:1710
 ext4_xattr_ibody_set+0x264/0x720 fs/ext4/xattr.c:2220
 ext4_xattr_move_to_block fs/ext4/xattr.c:2623 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2691 [inline]
 ext4_expand_extra_isize_ea+0x1147/0x1c40 fs/ext4/xattr.c:2783
 __ext4_expand_extra_isize+0x302/0x400 fs/ext4/inode.c:5936
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5979 [inline]
 __ext4_mark_inode_dirty+0x54f/0x920 fs/ext4/inode.c:6057
 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6089
 __mark_inode_dirty+0x331/0xf80 fs/fs-writeback.c:2433
 generic_update_time fs/inode.c:1946 [inline]
 inode_update_time fs/inode.c:1959 [inline]
 touch_atime+0x3fa/0x680 fs/inode.c:2031
 file_accessed include/linux/fs.h:2600 [inline]
 filemap_read+0x2ef3/0x31d0 mm/filemap.c:2835
 __kernel_read+0x421/0x890 fs/read_write.c:428
 integrity_kernel_read+0xac/0xf0 security/integrity/iint.c:228
 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
 ima_calc_file_hash+0x163f/0x1d10 security/integrity/ima/ima_crypto.c:573
 ima_collect_measurement+0x566/0xc90 security/integrity/ima/ima_api.c:293
 process_measurement+0x135c/0x21b0 security/integrity/ima/ima_main.c:351
 ima_file_check+0xed/0x170 security/integrity/ima/ima_main.c:534
 do_open fs/namei.c:3628 [inline]
 path_openat+0x2687/0x2e60 fs/namei.c:3783
 do_filp_open+0x230/0x480 fs/namei.c:3810
 do_sys_openat2+0x13b/0x4f0 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9be7d8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9be8bf4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9be7fa5fa0 RCX: 00007f9be7d8d169
RDX: 0000000000000042 RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007f9be7e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9be7fa5fa0 R15: 00007ffdca4ae408
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c89680 refcount:2 mapcount:0 mapping:ffff8880241949f8 index:0x2 pfn:0x7225a
memcg:ffff88805359c000
aops:def_blk_aops ino:700000
flags: 0xfff58000002056(referenced|uptodate|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff58000002056 ffffea00013de6c8 ffffea0001c7bc88 ffff8880241949f8
raw: 0000000000000002 ffff88806f62acb0 00000002ffffffff ffff88805359c000
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_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 7485, tgid 7484 (syz.0.581), ts 257028693098, free_ts 257005611829
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4328
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5606
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2292
 filemap_alloc_folio+0xda/0x4f0 mm/filemap.c:999
 __filemap_get_folio+0x749/0xe80 mm/filemap.c:1993
 pagecache_get_page+0x28/0x250 mm/folio-compat.c:110
 find_or_create_page include/linux/pagemap.h:646 [inline]
 grow_dev_page fs/buffer.c:946 [inline]
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x211/0xa20 fs/buffer.c:1333
 sb_getblk include/linux/buffer_head.h:356 [inline]
 __ext4_get_inode_loc+0x4ed/0xe40 fs/ext4/inode.c:4511
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4624 [inline]
 __ext4_iget+0x4ff/0x3ee0 fs/ext4/inode.c:4846
 ext4_lookup+0x3f5/0x740 fs/ext4/namei.c:1858
 lookup_open fs/namei.c:3460 [inline]
 open_last_lookups fs/namei.c:3550 [inline]
 path_openat+0x10fb/0x2e60 fs/namei.c:3780
 do_filp_open+0x230/0x480 fs/namei.c:3810
 do_sys_openat2+0x13b/0x4f0 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384
 free_unref_page_list+0x663/0x900 mm/page_alloc.c:3525
 release_pages+0x24c4/0x27a0 mm/swap.c:1035
 __pagevec_release+0x80/0xf0 mm/swap.c:1055
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 shmem_undo_range+0x865/0x2390 mm/shmem.c:946
 shmem_truncate_range mm/shmem.c:1062 [inline]
 shmem_evict_inode+0x265/0xa60 mm/shmem.c:1171
 evict+0x529/0x930 fs/inode.c:705
 __dentry_kill+0x436/0x650 fs/dcache.c:611
 dentry_kill+0xbb/0x290 fs/dcache.c:-1
 dput+0xfb/0x1d0 fs/dcache.c:918
 do_renameat2+0xded/0x1440 fs/namei.c:5029
 __do_sys_rename fs/namei.c:5073 [inline]
 __se_sys_rename fs/namei.c:5071 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5071
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88807225a180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807225a200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807225a280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                          ^
 ffff88807225a300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807225a380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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