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BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x5e/0x170
Read of size 8 at addr ffff8881783382f0 by task kworker/1:12/6128

CPU: 1 UID: 0 PID: 6128 Comm: kworker/1:12 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: infiniband ib_cache_event_task
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 __ethtool_get_link_ksettings+0x5e/0x170
 ib_get_eth_speed+0x180/0x7f0
 rxe_query_port+0x93/0x3d0
 ib_query_port+0x16e/0x830
 ib_cache_update+0x1ba/0xc50
 ib_cache_event_task+0xd3/0x1c0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 5614:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kvmalloc_node_noprof+0x520/0x890
 alloc_netdev_mqs+0xa9/0x1260
 rtnl_create_link+0x321/0xd70
 rtnl_newlink_create+0x25f/0xb00
 rtnl_newlink+0x167f/0x1bd0
 rtnetlink_rcv_msg+0x802/0xc00
 netlink_rcv_skb+0x226/0x4a0
 netlink_unicast+0x7bb/0x940
 netlink_sendmsg+0x813/0xb40
 __sys_sendto+0x672/0x710
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 13:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 device_release+0xc4/0x1f0
 kobject_put+0x222/0x550
 netdev_run_todo+0xc77/0xde0
 default_device_exit_batch+0x966/0x9e0
 ops_undo_list+0x4b4/0x8d0
 cleanup_net+0x572/0x810
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff888178338000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 752 bytes inside of
 freed 4096-byte region [ffff888178338000, ffff888178339000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x178338
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88810005d500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88810005d500 dead000000000100 dead000000000122
head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
head: 057ff00000000003 fffffffffffffe01 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 5609, tgid 5609 (syz-executor), ts 67370645521, free_ts 53510848866
 post_alloc_hook+0x22d/0x280
 get_page_from_freelist+0x24ae/0x2530
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x336/0x3d0
 __pcs_replace_empty_main+0x320/0x720
 __kmalloc_node_track_caller_noprof+0x565/0x7b0
 kmemdup_noprof+0x2b/0x70
 __addrconf_sysctl_register+0xa7/0x4b0
 addrconf_sysctl_register+0x168/0x1c0
 ipv6_add_dev+0xd26/0x13a0
 addrconf_notify+0x771/0x1050
 notifier_call_chain+0x1a5/0x3d0
 register_netdevice+0x18db/0x1f00
 veth_newlink+0x676/0xb70
 rtnl_newlink_create+0x310/0xb00
page last free pid 5547 tgid 5547 stack trace:
 __free_frozen_pages+0xc0d/0xd20
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x312/0x750
 tomoyo_realpath_from_path+0xef/0x640
 tomoyo_condition+0x1f3d/0x3320
 tomoyo_check_acl+0x182/0x400
 tomoyo_execute_permission+0x123/0x400
 tomoyo_find_next_domain+0x484/0x1a90
 tomoyo_bprm_check_security+0x11b/0x180
 security_bprm_check+0x85/0x240
 bprm_execve+0x918/0x1630
 do_execveat_common+0x4f1/0x670
 __x64_sys_execve+0x97/0xc0

Memory state around the buggy address:
 ffff888178338180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888178338200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888178338280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888178338300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888178338380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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