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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1339/0x36c0 fs/ext4/xattr.c:1740
Read of size 18446744073709551600 at addr ffff888121934008 by task syz.2.16/501

CPU: 1 PID: 501 Comm: syz.2.16 Not tainted 5.10.238-syzkaller-1007487-g59e9a7228857 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 mm/kasan/report.c:452
 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+0x1339/0x36c0 fs/ext4/xattr.c:1740
 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2243
 ext4_destroy_inline_data_nolock+0x1da/0x590 fs/ext4/inline.c:447
 ext4_convert_inline_data_nolock+0x3c2/0xc70 fs/ext4/inline.c:1240
 ext4_try_add_inline_entry+0x78a/0xae0 fs/ext4/inline.c:1349
 ext4_add_entry+0x5e9/0xf10 fs/ext4/namei.c:2414
 ext4_add_nondir+0x97/0x260 fs/ext4/namei.c:2786
 ext4_create+0x2d4/0x450 fs/ext4/namei.c:2831
 lookup_open fs/namei.c:3247 [inline]
 open_last_lookups fs/namei.c:3317 [inline]
 path_openat+0x16e3/0x3160 fs/namei.c:3506
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536
 do_sys_openat2+0x14c/0x6d0 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_openat fs/open.c:1249 [inline]
 __se_sys_openat fs/open.c:1244 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1244
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f66ac1d3169
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:00007f66abc45038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f66ac3ebfa0 RCX: 00007f66ac1d3169
RDX: 000000000000275a RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f66ac2542a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f66ac3ebfa0 R15: 00007ffe0151d6a8

The buggy address belongs to the page:
page:ffffea0004864d00 refcount:3 mapcount:1 mapping:ffff88810919d390 index:0x9 pfn:0x121934
aops:def_blk_aops ino:0
flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk)
raw: 400000000002203e ffffea0004955cc8 ffffea000488f8c8 ffff88810919d390
raw: 0000000000000009 ffff8881266e52a0 0000000300000000 ffff88810bb5a000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88810bb5a000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 501, ts 52857495753, free_ts 52436391199
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5357
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 __page_cache_alloc include/linux/pagemap.h:290 [inline]
 pagecache_get_page+0x642/0x930 mm/filemap.c:1848
 find_or_create_page include/linux/pagemap.h:402 [inline]
 grow_dev_page fs/buffer.c:976 [inline]
 grow_buffers fs/buffer.c:1045 [inline]
 __getblk_slow fs/buffer.c:1072 [inline]
 __getblk_gfp+0x212/0x780 fs/buffer.c:1370
 sb_getblk include/linux/buffer_head.h:361 [inline]
 ext4_xattr_block_set+0x1c06/0x2a50 fs/ext4/xattr.c:2108
 ext4_xattr_move_to_block fs/ext4/xattr.c:2622 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2697 [inline]
 ext4_expand_extra_isize_ea+0xfd8/0x1a10 fs/ext4/xattr.c:2789
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5983
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6026 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x610 fs/ext4/inode.c:6103
 ext4_evict_inode+0xe31/0x16e0 fs/ext4/inode.c:283
 evict+0x478/0x910 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x638/0x7c0 fs/inode.c:1762
 ext4_orphan_cleanup+0x96c/0xd30 fs/ext4/super.c:3121
 ext4_fill_super+0x845b/0x8b60 fs/ext4/super.c:5075
 mount_bdev+0x28b/0x3a0 fs/super.c:1442
 ext4_mount+0x34/0x40 fs/ext4/super.c:6662
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443
 release_pages+0xe38/0xe80 mm/swap.c:1103
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x175/0x300 mm/mmu_gather.c:326
 exit_mmap+0x2fc/0x540 mm/mmap.c:3375
 __mmput+0x93/0x2f0 kernel/fork.c:1153
 mmput+0x4e/0x150 kernel/fork.c:1176
 exit_mm kernel/exit.c:539 [inline]
 do_exit+0x986/0x2470 kernel/exit.c:850
 do_group_exit+0x141/0x310 kernel/exit.c:985
 get_signal+0xf7d/0x12e0 kernel/signal.c:2793
 arch_do_signal_or_restart+0xbf/0x10f0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff888121933f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888121933f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888121934000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffff888121934080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888121934100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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