==================================================================
BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa0/0x6b0 kernel/bpf/devmap.c:667
Read of size 8 at addr ffff88815e502b00 by task kworker/1:15/32672

CPU: 1 PID: 32672 Comm: kworker/1:15 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-wg2 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 28170:
 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]
 kmem_cache_alloc_trace+0x119/0x270 mm/slub.c:3269
 kmalloc include/linux/slab.h:616 [inline]
 kzalloc include/linux/slab.h:747 [inline]
 mmu_notifier_subscriptions_init include/linux/mmu_notifier.h:516 [inline]
 mm_init+0x36b/0x980 kernel/fork.c:1123
 dup_mm kernel/fork.c:1519 [inline]
 copy_mm+0x1dd/0x1390 kernel/fork.c:1574
 copy_process+0x1159/0x3250 kernel/fork.c:2263
 kernel_clone+0x23f/0x940 kernel/fork.c:2661
 __do_sys_clone kernel/fork.c:2787 [inline]
 __se_sys_clone kernel/fork.c:2771 [inline]
 __x64_sys_clone+0x176/0x1d0 kernel/fork.c:2771
 x64_sys_call+0x41f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
 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 17751:
 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
 destroy_list_workfn+0x1c7/0x270 kernel/locking/percpu-rwsem.c:321
 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_notify_flags+0x28f/0x500 net/core/dev.c:-1
 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8936
 do_setlink+0xbed/0x3990 net/core/rtnetlink.c:2779
 rtnl_group_changelink net/core/rtnetlink.c:3296 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3460 [inline]
 rtnl_newlink+0xd6b/0x17b0 net/core/rtnetlink.c:3572
 rtnetlink_rcv_msg+0x9e4/0xb90 net/core/rtnetlink.c:5650
 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2493
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
 netlink_unicast+0x87c/0xa40 net/netlink/af_netlink.c:1341
 netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526
 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 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 ffff88815e502b00
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff88815e502b00, ffff88815e502b60)
The buggy address belongs to the page:
page:ffffea0005794080 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88815e502400 pfn:0x15e502
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004393e40 0000000500000005 ffff888100042900
raw: ffff88815e502400 000000008020001c 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 30515, ts 1229006567353, free_ts 1227264977800
 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
 kmalloc include/linux/slab.h:616 [inline]
 kzalloc include/linux/slab.h:747 [inline]
 vhost_vsock_alloc_pkt drivers/vhost/vsock.c:369 [inline]
 vhost_vsock_handle_tx_kick+0x3a6/0xb90 drivers/vhost/vsock.c:537
 vhost_worker+0x1a9/0x2d0 drivers/vhost/vhost.c:372
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534
 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5857
 __vunmap+0x84d/0x9e0 mm/vmalloc.c:2652
 __vfree mm/vmalloc.c:2701 [inline]
 vfree+0x8b/0xc0 mm/vmalloc.c:2732
 vc_uniscr_free drivers/tty/vt/vt.c:363 [inline]
 vc_uniscr_set drivers/tty/vt/vt.c:368 [inline]
 vc_do_resize+0xc16/0x1740 drivers/tty/vt/vt.c:1302
 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1362
 vt_resizex+0x3d8/0x570 drivers/tty/vt/vt_ioctl.c:718
 vt_ioctl+0xdff/0x19a0 drivers/tty/vt/vt_ioctl.c:937
 tty_ioctl+0x848/0xc60 drivers/tty/tty_io.c:2810
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:860
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860
 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 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

Memory state around the buggy address:
 ffff88815e502a00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88815e502a80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88815e502b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff88815e502b80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88815e502c00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!