==================================================================
BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa0/0x6b0 kernel/bpf/devmap.c:667
Read of size 8 at addr ffff888109ce8600 by task kworker/1:0/26

CPU: 1 PID: 26 Comm: kworker/1:0 Tainted: G        W         5.15.180-syzkaller-00024-g88c4075c39ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 dev_map_generic_redirect+0xa0/0x6b0 kernel/bpf/devmap.c:667
 xdp_do_generic_redirect_map net/core/filter.c:4177 [inline]
 xdp_do_generic_redirect+0x40e/0xa80 net/core/filter.c:4236
 do_xdp_generic+0x516/0x7a0 net/core/dev.c:4950
 __netif_receive_skb_core+0x12ac/0x2f10 net/core/dev.c:5355
 __netif_receive_skb_one_core net/core/dev.c:5530 [inline]
 __netif_receive_skb+0x72/0x280 net/core/dev.c:5646
 process_backlog+0x368/0x600 net/core/dev.c:6523
 __napi_poll+0xbe/0x590 net/core/dev.c:7082
 napi_poll net/core/dev.c:7149 [inline]
 net_rx_action+0x371/0x8e0 net/core/dev.c:7239
 handle_softirqs+0x250/0x560 kernel/softirq.c:565
 __do_softirq+0xb/0xd kernel/softirq.c:603
 do_softirq+0xc6/0x120 kernel/softirq.c:452
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:251 [inline]
 _raw_read_unlock_bh+0x29/0x30 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x172/0x1d0 drivers/net/wireguard/socket.c:184
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1bf/0x480 drivers/net/wireguard/send.c:276
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Allocated by task 14050:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4431
 __kmalloc_node include/linux/slab.h:484 [inline]
 kmalloc_node include/linux/slab.h:639 [inline]
 bpf_map_kmalloc_node+0xb9/0x140 kernel/bpf/syscall.c:432
 __dev_map_alloc_node+0x5a/0x4d0 kernel/bpf/devmap.c:850
 __dev_map_update_elem kernel/bpf/devmap.c:914 [inline]
 dev_map_update_elem+0x1bc/0x330 kernel/bpf/devmap.c:933
 bpf_map_update_value+0x30e/0x3e0 kernel/bpf/syscall.c:223
 map_update_elem+0x5bb/0x740 kernel/bpf/syscall.c:1165
 __sys_bpf+0x40c/0x730 kernel/bpf/syscall.c:4618
 __do_sys_bpf kernel/bpf/syscall.c:4734 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4732 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4732
 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 26:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kfree+0xc4/0x270 mm/slub.c:4583
 dev_map_free+0x580/0x6b0 kernel/bpf/devmap.c:237
 bpf_map_free_deferred+0x10e/0x1e0 kernel/bpf/syscall.c:481
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 insert_work+0x51/0x310 kernel/workqueue.c:1373
 __queue_work+0x8e5/0xc60 kernel/workqueue.c:1539
 queue_work_on+0xd2/0x140 kernel/workqueue.c:1566
 queue_work include/linux/workqueue.h:510 [inline]
 schedule_work include/linux/workqueue.h:571 [inline]
 nf_nat_masq_schedule+0x3f7/0x4c0 net/netfilter/nf_nat_masquerade.c:125
 masq_inet6_event+0xe6/0x130 net/netfilter/nf_nat_masquerade.c:290
 notifier_call_chain kernel/notifier.c:83 [inline]
 atomic_notifier_call_chain+0x99/0x110 kernel/notifier.c:198
 inet6addr_notifier_call_chain+0x24/0x30 net/ipv6/addrconf_core.c:109
 addrconf_ifdown+0xd69/0x1880 net/ipv6/addrconf.c:3923
 addrconf_notify+0x3bd/0xde0 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391
 call_netdevice_notifiers_info net/core/dev.c:2057 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2069 [inline]
 call_netdevice_notifiers net/core/dev.c:2083 [inline]
 dev_close_many+0x32d/0x4d0 net/core/dev.c:1658
 unregister_netdevice_many+0x44c/0x1990 net/core/dev.c:11125
 unregister_netdevice_queue+0x31c/0x360 net/core/dev.c:11082
 unregister_netdevice include/linux/netdevice.h:3057 [inline]
 __tun_detach+0xca6/0x1450 drivers/net/tun.c:686
 tun_detach drivers/net/tun.c:702 [inline]
 tun_chr_close+0x92/0x140 drivers/net/tun.c:3440
 __fput+0x20b/0x8b0 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa76/0x27a0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 __do_sys_exit_group kernel/exit.c:1013 [inline]
 __se_sys_exit_group kernel/exit.c:1011 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888109ce8600
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff888109ce8600, ffff888109ce8660)
The buggy address belongs to the page:
page:ffffea0004273a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109ce8
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004196dc0 0000000400000004 ffff888100042900
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 1793369683, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5781
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:1995
 ___slab_alloc+0x381/0x810 mm/slub.c:3028
 __slab_alloc+0x49/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3267
 kmem_cache_alloc_node_trace include/linux/slab.h:505 [inline]
 kmalloc_node include/linux/slab.h:634 [inline]
 kzalloc_node include/linux/slab.h:758 [inline]
 blk_alloc_flush_queue+0x7f/0x250 block/blk-flush.c:470
 blk_mq_alloc_hctx block/blk-mq.c:2842 [inline]
 blk_mq_alloc_and_init_hctx block/blk-mq.c:3218 [inline]
 blk_mq_realloc_hw_ctxs+0xb7b/0x1700 block/blk-mq.c:3270
 blk_mq_init_allocated_queue+0x3fa/0x17e0 block/blk-mq.c:3331
 blk_mq_init_queue_data block/blk-mq.c:3166 [inline]
 blk_mq_init_queue+0x6c/0xd0 block/blk-mq.c:3176
 scsi_alloc_sdev+0x66c/0x9c0 drivers/scsi/scsi_scan.c:319
 scsi_probe_and_add_lun+0x18d/0x33b0 drivers/scsi/scsi_scan.c:1156
 __scsi_scan_target+0x1d6/0xb50 drivers/scsi/scsi_scan.c:1637
 scsi_scan_channel drivers/scsi/scsi_scan.c:1725 [inline]
 scsi_scan_host_selected+0x343/0x5f0 drivers/scsi/scsi_scan.c:1754
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888109ce8500: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888109ce8580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888109ce8600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff888109ce8680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888109ce8700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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