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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1785
Read of size 18446744073709551572 at addr ffff888028bc4850 by task syz.5.459/7678

CPU: 0 UID: 0 PID: 7678 Comm: syz.5.459 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+0x8e9/0x1e20 fs/ext4/xattr.c:1785
 ext4_xattr_block_set+0x878/0x2ad0 fs/ext4/xattr.c:2032
 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline]
 ext4_expand_extra_isize_ea+0x12cf/0x1ea0 fs/ext4/xattr.c:2834
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6434
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline]
 __ext4_mark_inode_dirty+0x45c/0x710 fs/ext4/inode.c:6555
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6587
 __mark_inode_dirty+0x3a4/0x13b0 fs/fs-writeback.c:2623
 generic_update_time fs/inode.c:2198 [inline]
 file_update_time_flags+0x3ee/0x4a0 fs/inode.c:2428
 ext4_write_checks+0x2a9/0x480 fs/ext4/file.c:281
 ext4_buffered_write_iter+0xaa/0x3a0 fs/ext4/file.c:312
 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_pwrite64 fs/read_write.c:795 [inline]
 __do_sys_pwrite64 fs/read_write.c:803 [inline]
 __se_sys_pwrite64 fs/read_write.c:800 [inline]
 __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800
 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
RIP: 0033:0x7fbc8599ce59
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:00007fbc8690c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fbc85c16090 RCX: 00007fbc8599ce59
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000005
RBP: 00007fbc85a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbc85c16128 R14: 00007fbc85c16090 R15: 00007ffe6e52f2a8
 </TASK>

Allocated by task 7678:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5296 [inline]
 __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5408
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ext4_xattr_block_set+0x787/0x2ad0 fs/ext4/xattr.c:1980
 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline]
 ext4_expand_extra_isize_ea+0x12cf/0x1ea0 fs/ext4/xattr.c:2834
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6434
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline]
 __ext4_mark_inode_dirty+0x45c/0x710 fs/ext4/inode.c:6555
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6587
 __mark_inode_dirty+0x3a4/0x13b0 fs/fs-writeback.c:2623
 generic_update_time fs/inode.c:2198 [inline]
 file_update_time_flags+0x3ee/0x4a0 fs/inode.c:2428
 ext4_write_checks+0x2a9/0x480 fs/ext4/file.c:281
 ext4_buffered_write_iter+0xaa/0x3a0 fs/ext4/file.c:312
 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_pwrite64 fs/read_write.c:795 [inline]
 __do_sys_pwrite64 fs/read_write.c:803 [inline]
 __se_sys_pwrite64 fs/read_write.c:800 [inline]
 __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800
 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

The buggy address belongs to the object at ffff888028bc4800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff888028bc4800, ffff888028bc4c00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28bc0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fe17dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fe17dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 7404479967, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1853
 prep_new_page mm/page_alloc.c:1861 [inline]
 get_page_from_freelist+0x2593/0x2610 mm/page_alloc.c:3941
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3467
 new_slab mm/slub.c:3525 [inline]
 refill_objects+0x339/0x3d0 mm/slub.c:7272
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4652
 alloc_from_pcs mm/slub.c:4750 [inline]
 slab_alloc_node mm/slub.c:4884 [inline]
 __do_kmalloc_node mm/slub.c:5295 [inline]
 __kmalloc_noprof+0x474/0x760 mm/slub.c:5308
 kmalloc_noprof include/linux/slab.h:954 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 __alloc_workqueue+0x100/0x1f50 kernel/workqueue.c:5829
 alloc_workqueue_va kernel/workqueue.c:5931 [inline]
 alloc_workqueue_noprof+0xe3/0x210 kernel/workqueue.c:5947
 ieee80211_register_hw+0x3612/0x4a70 net/mac80211/main.c:1517
 mac80211_hwsim_new_radio+0x3335/0x5aa0 drivers/net/wireless/virtual/mac80211_hwsim.c:6019
 init_mac80211_hwsim+0x44d/0x570 drivers/net/wireless/virtual/mac80211_hwsim.c:7394
 do_one_initcall+0x250/0x870 init/main.c:1392
 do_initcall_level+0x104/0x190 init/main.c:1454
 do_initcalls+0x59/0xa0 init/main.c:1470
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1703
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888028bc4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888028bc4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888028bc4800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888028bc4880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888028bc4900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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