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BUG: KASAN: stack-out-of-bounds in memcmp+0xfc/0x230
Read of size 8 at addr ffffc9000310f987 by task syz.2.1575/12255

CPU: 1 UID: 0 PID: 12255 Comm: syz.2.1575 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
 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: 0033:0x7f2cc5b8ebe9
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:00007f2cc6a68038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2cc5dc5fa0 RCX: 00007f2cc5b8ebe9
RDX: 00002000000002c0 RSI: 0000000000008924 RDI: 0000000000000006
RBP: 00007f2cc5c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2cc5dc6038 R14: 00007f2cc5dc5fa0 R15: 00007ffcb69cbdf8
 </TASK>

The buggy address belongs to stack of task syz.2.1575/12255
 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 vmalloc virtual mapping
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x40e66
memcg:ffff88803a05ec82
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88803a05ec82
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 12245, tgid 12245 (syz.2.1574), ts 151421825828, free_ts 151378181300
 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 5999 tgid 5999 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __tlb_remove_table+0x2d2/0x3b0
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0xcab/0x1770
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0x57/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20

Memory state around the buggy address:
 ffffc9000310f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000310f900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
>ffffc9000310f980: 06 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffffc9000310fa00: 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
 ffffc9000310fa80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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