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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20
Read of size 18446744073709551572 at addr ffff888112715050 by task syz.4.407/7752

CPU: 0 UID: 0 PID: 7752 Comm: syz.4.407 Not tainted syzkaller #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+0xca/0x240
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 __asan_memmove+0x29/0x70
 ext4_xattr_set_entry+0x8e9/0x1e20
 ext4_xattr_block_set+0x872/0x2ac0
 ext4_expand_extra_isize_ea+0x12da/0x1ea0
 __ext4_expand_extra_isize+0x30d/0x400
 __ext4_mark_inode_dirty+0x46c/0x700
 ext4_rename2+0x1f06/0x2f50
 vfs_rename+0xb34/0xe80
 do_renameat2+0x6a2/0xa50
 __x64_sys_rename+0x82/0x90
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81bd38f749
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:00007f81be2ea038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f81bd5e5fa0 RCX: 00007f81bd38f749
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000000
RBP: 00007f81bd413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81bd5e6038 R14: 00007f81bd5e5fa0 R15: 00007ffe47334bb8
 </TASK>

Allocated by task 7752:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x571/0x810
 kmemdup_noprof+0x2b/0x70
 ext4_xattr_block_set+0x781/0x2ac0
 ext4_expand_extra_isize_ea+0x12da/0x1ea0
 __ext4_expand_extra_isize+0x30d/0x400
 __ext4_mark_inode_dirty+0x46c/0x700
 ext4_rename2+0x1f06/0x2f50
 vfs_rename+0xb34/0xe80
 do_renameat2+0x6a2/0xa50
 __x64_sys_rename+0x82/0x90
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888112715000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff888112715000, ffff888112715400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112710
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff888100041dc0 ffffea0005d18c00 dead000000000003
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 017ff00000000040 ffff888100041dc0 ffffea0005d18c00 dead000000000003
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 017ff00000000003 ffffea000449c401 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5927, tgid 5926 (syz.1.14), ts 59132752940, free_ts 59058021472
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x2365/0x2440
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x96/0x350
 ___slab_alloc+0xf56/0x1990
 __slab_alloc+0x65/0x100
 __kmalloc_node_track_caller_noprof+0x5d0/0x810
 kmalloc_reserve+0x136/0x290
 __alloc_skb+0x142/0x2d0
 xfrm_send_state_notify+0x884/0x18b0
 km_state_notify+0x110/0x1f0
 pfkey_add+0x2000/0x2e00
 pfkey_sendmsg+0xbfe/0x1090
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
page last free pid 5813 tgid 5813 stack trace:
 __free_frozen_pages+0xbc8/0xd30
 __put_partials+0x146/0x170
 put_cpu_partial+0x1f2/0x2e0
 __slab_free+0x2b9/0x390
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x37d/0x700
 getname_flags+0xb8/0x540
 do_sys_openat2+0xbc/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888112714f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888112714f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888112715000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888112715080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888112715100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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