netlink: 'syz.0.3950': attribute type 1 has an invalid length.
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BUG: KASAN: stack-out-of-bounds in memcmp+0xfc/0x230
Read of size 8 at addr ffffc90007a67987 by task syz.0.3950/21575

CPU: 0 UID: 0 PID: 21575 Comm: syz.0.3950 Not tainted 6.16.0-syzkaller-12063-g37816488247d-dirty #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
 memcmp+0xfc/0x230
 __hw_addr_del_ex+0x82/0x4e0
 dev_uc_del+0x9d/0x110
 macsec_set_mac_address+0x32d/0x550
 netif_set_mac_address+0x2fc/0x4c0
 dev_set_mac_address_user+0x137/0x270
 dev_ioctl+0x7b4/0x1150
 sock_do_ioctl+0x22c/0x300
 sock_ioctl+0x576/0x790
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08ad78ebe9
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:00007f08ae6d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f08ad9b5fa0 RCX: 00007f08ad78ebe9
RDX: 00002000000002c0 RSI: 0000000000008924 RDI: 0000000000000003
RBP: 00007f08ad811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f08ad9b6038 R14: 00007f08ad9b5fa0 R15: 00007ffc56cc6b48
 </TASK>

The buggy address belongs to stack of task syz.0.3950/21575
 and is located at offset 39 in frame:
 macsec_set_mac_address+0x0/0x550

This frame has 2 objects:
 [32, 38) 'old_addr'
 [64, 248) 'ctx'

The buggy address belongs to a 8-page vmalloc region starting at 0xffffc90007a60000 allocated at copy_process+0x54b/0x3c00
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880433a20f0 pfn:0x433a2
memcg:ffff888112f41602
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff8880433a20f0 0000000000000000 00000001ffffffff ffff888112f41602
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), pid 21559, tgid 21559 (syz.1.3947), ts 341805544567, free_ts 341737385354
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 alloc_pages_noprof+0xa9/0x190
 __vmalloc_node_range_noprof+0x97d/0x12f0
 __vmalloc_node_noprof+0xc2/0x110
 dup_task_struct+0x3e7/0x860
 copy_process+0x54b/0x3c00
 kernel_clone+0x21e/0x840
 __se_sys_clone3+0x256/0x2d0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 21552 tgid 21551 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 netlink_sendmsg+0x5c6/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0

Memory state around the buggy address:
 ffffc90007a67880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90007a67900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
>ffffc90007a67980: 06 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffffc90007a67a00: 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
 ffffc90007a67a80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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