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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xaf2/0x21d0 fs/ext4/xattr.c:1719
Read of size 18446744073709551600 at addr ffff88812f0a0008 by task syz.2.16/474

CPU: 1 PID: 474 Comm: syz.2.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x280/0x290 mm/kasan/generic.c:189
 memmove+0x2d/0x70 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0xaf2/0x21d0 fs/ext4/xattr.c:1719
 ext4_xattr_ibody_set+0x24e/0x6c0 fs/ext4/xattr.c:2229
 ext4_destroy_inline_data_nolock+0x211/0x5b0 fs/ext4/inline.c:459
 ext4_convert_inline_data_nolock+0x3c9/0x9e0 fs/ext4/inline.c:1240
 ext4_try_add_inline_entry+0x784/0xad0 fs/ext4/inline.c:1350
 ext4_add_entry+0x4eb/0xd70 fs/ext4/namei.c:2458
 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2845
 ext4_create+0x2e0/0x460 fs/ext4/namei.c:2891
 lookup_open fs/namei.c:3481 [inline]
 open_last_lookups fs/namei.c:3549 [inline]
 path_openat+0x11e3/0x2f50 fs/namei.c:3779
 do_filp_open+0x1c1/0x3c0 fs/namei.c:3809
 do_sys_openat2+0x185/0x7e0 fs/open.c:1341
 do_sys_open fs/open.c:1357 [inline]
 __do_sys_openat fs/open.c:1373 [inline]
 __se_sys_openat fs/open.c:1368 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1368
 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3aba78e929
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:00007f3abb528038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f3aba9b5fa0 RCX: 00007f3aba78e929
RDX: 000000000000275a RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f3aba810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3aba9b5fa0 R15: 00007ffdb2c0ea38
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0004bc2800 refcount:4 mapcount:1 mapping:ffff88810b706ed0 index:0x9 pfn:0x12f0a0
memcg:ffff888100239d40
aops:def_blk_aops ino:700002
flags: 0x460000000002204e(referenced|uptodate|dirty|workingset|private|mappedtodisk|zone=1)
raw: 460000000002204e 0000000000000000 dead000000000122 ffff88810b706ed0
raw: 0000000000000009 ffff8881246b4888 0000000400000000 ffff888100239d40
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 474, tgid 473 (syz.2.16), ts 50406668438, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650
 get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4554
 __alloc_pages+0x1c3/0x450 mm/page_alloc.c:5868
 __folio_alloc+0x12/0x40 mm/page_alloc.c:5900
 __folio_alloc_node include/linux/gfp.h:245 [inline]
 folio_alloc include/linux/gfp.h:274 [inline]
 filemap_alloc_folio include/linux/pagemap.h:513 [inline]
 __filemap_get_folio+0x6ec/0x980 mm/filemap.c:2018
 pagecache_get_page+0x2b/0x110 mm/folio-compat.c:110
 find_or_create_page include/linux/pagemap.h:654 [inline]
 grow_dev_page fs/buffer.c:989 [inline]
 grow_buffers fs/buffer.c:1054 [inline]
 __getblk_slow fs/buffer.c:1081 [inline]
 __getblk_gfp+0x217/0x7d0 fs/buffer.c:1376
 sb_getblk include/linux/buffer_head.h:356 [inline]
 ext4_xattr_block_set+0x1dfe/0x3270 fs/ext4/xattr.c:2084
 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline]
 ext4_expand_extra_isize_ea+0xf30/0x1990 fs/ext4/xattr.c:2792
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5968
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6011 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6089
 ext4_evict_inode+0xc0b/0x1460 fs/ext4/inode.c:279
 evict+0x493/0x890 fs/inode.c:708
 iput_final fs/inode.c:1844 [inline]
 iput+0x620/0x670 fs/inode.c:1870
 ext4_process_orphan+0x2b1/0x320 fs/ext4/orphan.c:360
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88812f09ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812f09ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812f0a0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffff88812f0a0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812f0a0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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