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BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x5e/0x170
Read of size 8 at addr ffff88811f6f22f0 by task kworker/1:3/5853

CPU: 1 UID: 0 PID: 5853 Comm: kworker/1:3 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
Workqueue: events smc_ib_port_event_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_report+0xba/0x230
 kasan_report+0x117/0x150
 __ethtool_get_link_ksettings+0x5e/0x170
 ib_get_eth_speed+0x180/0x7f0
 rxe_query_port+0x93/0x3d0
 ib_query_port+0x170/0x830
 smc_ib_port_event_work+0x15a/0x940
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 5805:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kvmalloc_node_noprof+0x59a/0x8d0
 alloc_netdev_mqs+0xa6/0x11b0
 rtnl_create_link+0x31f/0xd70
 rtnl_newlink_create+0x277/0xb70
 rtnl_newlink+0x1666/0x1be0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3c0/0x550
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 24561:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1be/0x650
 device_release+0x9e/0x1d0
 kobject_put+0x228/0x560
 netdev_run_todo+0xc75/0xde0
 rtnl_dellink+0x6a7/0x820
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x4d7/0x810
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88811f6f2000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 752 bytes inside of
 freed 4096-byte region [ffff88811f6f2000, ffff88811f6f3000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f6f0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888112543b81
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff88810004b500 ffffea000481f200 dead000000000002
raw: 0000000000000000 0000000000040004 00000000f5000000 ffff888112543b81
head: 017ff00000000040 ffff88810004b500 ffffea000481f200 dead000000000002
head: 0000000000000000 0000000000040004 00000000f5000000 ffff888112543b81
head: 017ff00000000003 ffffea00047dbc01 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 5805, tgid 5805 (syz-executor), ts 55920828895, free_ts 51607749806
 post_alloc_hook+0x228/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x86/0x3a0
 ___slab_alloc+0xd82/0x1760
 __slab_alloc+0x65/0x100
 __kmalloc_noprof+0x46c/0x7e0
 __register_sysctl_table+0x72/0x1340
 __addrconf_sysctl_register+0x331/0x4d0
 addrconf_sysctl_register+0x168/0x1c0
 ipv6_add_dev+0xd26/0x13a0
 addrconf_notify+0x771/0x1050
 notifier_call_chain+0x19d/0x3a0
 register_netdevice+0x1637/0x1ae0
 virt_wifi_newlink+0x428/0x860
page last free pid 5731 tgid 5731 stack trace:
 free_unref_folios+0xd9e/0x14d0
 folios_put_refs+0x58a/0x680
 free_pages_and_swap_cache+0x2e7/0x5b0
 tlb_flush_mmu+0x3a8/0x680
 tlb_finish_mmu+0xf9/0x230
 vms_clear_ptes+0x44d/0x570
 vms_complete_munmap_vmas+0x205/0x890
 do_vmi_align_munmap+0x3b7/0x4b0
 do_vmi_munmap+0x252/0x2d0
 __vm_munmap+0x22c/0x3d0
 __x64_sys_munmap+0x60/0x70
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88811f6f2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811f6f2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811f6f2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff88811f6f2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811f6f2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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