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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x179e/0x1e20
Read of size 18446744073709550592 at addr ffff88803b5b1400 by task syz.8.5313/25047

CPU: 0 UID: 0 PID: 25047 Comm: syz.8.5313 Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xd2/0x2b0
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 __asan_memmove+0x29/0x70
 ext4_xattr_set_entry+0x179e/0x1e20
 ext4_xattr_block_set+0x872/0x2ac0
 ext4_xattr_set_handle+0xdfb/0x1590
 ext4_xattr_set+0x230/0x320
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x16b/0x2f0
 filename_setxattr+0x274/0x600
 path_setxattrat+0x364/0x3a0
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46f758e9a9
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:00007f46f831c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f46f77b6080 RCX: 00007f46f758e9a9
RDX: 0000200000000340 RSI: 0000200000000140 RDI: 0000200000000100
RBP: 00007f46f7610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f46f77b6080 R15: 00007ffc1f684b68
 </TASK>

Allocated by task 25047:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x271/0x4e0
 kmemdup_noprof+0x2b/0x70
 ext4_xattr_block_set+0x781/0x2ac0
 ext4_xattr_set_handle+0xdfb/0x1590
 ext4_xattr_set+0x230/0x320
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x16b/0x2f0
 filename_setxattr+0x274/0x600
 path_setxattrat+0x364/0x3a0
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88803b5b1000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes to the right of
 1024-byte region [ffff88803b5b1000, ffff88803b5b1400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3b5b0
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 ffff88801a441dc0 ffffea0000f13c00 dead000000000002
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a441dc0 ffffea0000f13c00 dead000000000002
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000ed6c01 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5880, tgid 5880 (kworker/0:5), ts 55210037056, free_ts 0
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_noprof+0x305/0x4f0
 ___neigh_create+0x6d5/0x2260
 ip6_finish_output2+0xb4d/0x16a0
 NF_HOOK+0x9e/0x380
 mld_sendpack+0x800/0xd80
 mld_ifc_work+0x835/0xde0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88803b5b1300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88803b5b1380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88803b5b1400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88803b5b1480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803b5b1500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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