=========================================================[  403.366149][ T5340] ==================================================================
BUG: KASAN: slab-use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
BUG: KASAN: slab-use-after-free in netdev_lock_ops include/net/netdev_lock.h:41 [inline]
BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x26d/0x290 net/ethtool/ioctl.c:463
Read of size 1 at addr ffff888043da4f79 by task kworker/1:3/5340

CPU: 1 UID: 0 PID: 5340 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events smc_ib_port_event_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
 netdev_lock_ops include/net/netdev_lock.h:41 [inline]
 __ethtool_get_link_ksettings+0x26d/0x290 net/ethtool/ioctl.c:463
 __ethtool_get_link_ksettings+0x142/0x290 net/ethtool/ioctl.c:464
 ib_get_eth_speed+0x180/0x800 drivers/infiniband/core/verbs.c:2057
 rxe_query_port+0x93/0x3e0 drivers/infiniband/sw/rxe/rxe_verbs.c:56
 __ib_query_port drivers/infiniband/core/device.c:2129 [inline]
 ib_query_port+0x170/0x840 drivers/infiniband/core/device.c:2161
 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline]
 smc_ib_port_event_work+0x16f/0x940 net/smc/smc_ib.c:388
 process_one_work+0x98b/0x1630 kernel/workqueue.c:3326
 process_scheduled_works kernel/workqueue.c:3409 [inline]
 worker_thread+0xb49/0x1140 kernel/workqueue.c:3490
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5780:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5357 [inline]
 __kvmalloc_node_noprof+0x403/0x910 mm/slub.c:6928
 alloc_netdev_mqs+0xa8/0x1220 net/core/dev.c:12058
 rtnl_create_link+0x31f/0xd70 net/core/rtnetlink.c:3713
 rtnl_newlink_create+0x277/0xb70 net/core/rtnetlink.c:3895
 __rtnl_newlink net/core/rtnetlink.c:4036 [inline]
 rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4151
 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:7068
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:785
 __sock_sendmsg net/socket.c:800 [inline]
 __sys_sendto+0x41a/0x5a0 net/socket.c:2267
 __do_sys_sendto net/socket.c:2274 [inline]
 __se_sys_sendto net/socket.c:2270 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2270
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 991:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2699 [inline]
 slab_free mm/slub.c:6400 [inline]
 kfree+0x1c5/0x6c0 mm/slub.c:6715
 device_release+0xc4/0x1f0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x228/0x560 lib/kobject.c:737
 netdev_run_todo+0x1140/0x12c0 net/core/dev.c:11759
 default_device_exit_batch+0x967/0x9e0 net/core/dev.c:13108
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56e/0x800 net/core/net_namespace.c:702
 process_one_work+0x98b/0x1630 kernel/workqueue.c:3326
 process_scheduled_works kernel/workqueue.c:3409 [inline]
 worker_thread+0xb49/0x1140 kernel/workqueue.c:3490
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888043da4000
 which belongs to the cache kmalloc-cg-8k of size 8192
The buggy address is located 3961 bytes inside of
 freed 8192-byte region [ffff888043da4000, ffff888043da6000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43da0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888043da2011
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813fe49640 dead000000000122 0000000000000000
raw: 0000000000000000 0000400000020002 00000000f5000000 ffff888043da2011
head: 0080000000000040 ffff88813fe49640 dead000000000122 0000000000000000
head: 0000000000000000 0000400000020002 00000000f5000000 ffff888043da2011
head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 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 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5780, tgid 5780 (syz-executor), ts 275804267636, free_ts 275332758375
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x265c/0x26e0 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3288 [inline]
 allocate_slab+0x76/0x5d0 mm/slub.c:3406
 new_slab mm/slub.c:3452 [inline]
 refill_objects+0x2d9/0x350 mm/slub.c:7333
 refill_sheaf mm/slub.c:2826 [inline]
 __pcs_replace_empty_main+0x331/0x690 mm/slub.c:4698
 alloc_from_pcs mm/slub.c:4796 [inline]
 slab_alloc_node mm/slub.c:4929 [inline]
 __do_kmalloc_node mm/slub.c:5356 [inline]
 __kvmalloc_node_noprof+0x72f/0x910 mm/slub.c:6928
 alloc_netdev_mqs+0xa8/0x1220 net/core/dev.c:12058
 rtnl_create_link+0x31f/0xd70 net/core/rtnetlink.c:3713
 rtnl_newlink_create+0x277/0xb70 net/core/rtnetlink.c:3895
 __rtnl_newlink net/core/rtnetlink.c:4036 [inline]
 rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4151
 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:7068
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:785
page last free pid 68 tgid 68 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_pages_ok+0xada/0xbc0 mm/page_alloc.c:1584
 __free_frozen_pages+0x122/0x1190 mm/page_alloc.c:2946
 batadv_hash_destroy+0x39/0x70 net/batman-adv/hash.c:33
 batadv_dat_hash_free net/batman-adv/distributed-arp-table.c:801 [inline]
 batadv_dat_free+0x96/0xc0 net/batman-adv/distributed-arp-table.c:843
 batadv_mesh_free+0x6f/0x130 net/batman-adv/main.c:271
 batadv_meshif_free+0x15/0x20 net/batman-adv/mesh-interface.c:992
 netdev_run_todo+0x10eb/0x12c0 net/core/dev.c:11752
 default_device_exit_batch+0x967/0x9e0 net/core/dev.c:13108
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56e/0x800 net/core/net_namespace.c:702
 process_one_work+0x98b/0x1630 kernel/workqueue.c:3326
 process_scheduled_works kernel/workqueue.c:3409 [inline]
 worker_thread+0xb49/0x1140 kernel/workqueue.c:3490
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888043da4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888043da4e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888043da4f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff888043da4f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888043da5000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================