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BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x5e/0x170
Read of size 8 at addr ffff88816e85e2e8 by task kworker/1:3/5839

CPU: 1 UID: 0 PID: 5839 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 5844:
 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 12:
 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
 default_device_exit_batch+0x98c/0xa10
 ops_undo_list+0x52b/0x940
 cleanup_net+0x4df/0x7b0
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff88816e85e000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 744 bytes inside of
 freed 4096-byte region [ffff88816e85e000, ffff88816e85f000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88816e858000 pfn:0x16e858
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88816637d201
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88810004b500 ffffea0005adb810 ffffea0005ac9810
raw: ffff88816e858000 0000000000040002 00000000f5000000 ffff88816637d201
head: 057ff00000000240 ffff88810004b500 ffffea0005adb810 ffffea0005ac9810
head: ffff88816e858000 0000000000040002 00000000f5000000 ffff88816637d201
head: 057ff00000000003 ffffea0005ba1601 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 5844, tgid 5844 (syz-executor), ts 65245600032, free_ts 34769601466
 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_cache_noprof+0x40d/0x6e0
 ipv6_add_dev+0x6aa/0x13a0
 addrconf_notify+0x771/0x1050
 notifier_call_chain+0x19d/0x3a0
 register_netdevice+0x15e8/0x1a90
 virt_wifi_newlink+0x428/0x860
 rtnl_newlink_create+0x329/0xb70
 rtnl_newlink+0x1666/0x1be0
 rtnetlink_rcv_msg+0x7d5/0xbe0
page last free pid 5291 tgid 5291 stack trace:
 __free_frozen_pages+0xbb0/0xd10
 __put_partials+0x146/0x170
 __slab_free+0x294/0x320
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x370/0x6e0
 getname_flags+0xb7/0x540
 do_sys_openat2+0xca/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88816e85e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88816e85e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88816e85e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff88816e85e300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88816e85e380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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