==================================================================
BUG: KASAN: use-after-free in cpu_map_generic_redirect+0x171/0x670 kernel/bpf/cpumap.c:786
Read of size 8 at addr ffff888116436618 by task kworker/0:3/298

CPU: 0 PID: 298 Comm: kworker/0:3 Not tainted 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
 cpu_map_generic_redirect+0x171/0x670 kernel/bpf/cpumap.c:786
 xdp_do_generic_redirect_map net/core/filter.c:4189 [inline]
 xdp_do_generic_redirect+0x3be/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 8:
 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 include/linux/slab.h:621 [inline]
 kzalloc include/linux/slab.h:747 [inline]
 tnode_alloc net/ipv4/fib_trie.c:331 [inline]
 tnode_new+0xc8/0x320 net/ipv4/fib_trie.c:384
 halve net/ipv4/fib_trie.c:639 [inline]
 resize+0x1055/0x1c70 net/ipv4/fib_trie.c:891
 trie_rebalance net/ipv4/fib_trie.c:1101 [inline]
 fib_remove_alias+0x4f8/0x730 net/ipv4/fib_trie.c:1664
 fib_table_delete+0xfcb/0x1210 net/ipv4/fib_trie.c:1767
 fib_magic net/ipv4/fib_frontend.c:1095 [inline]
 fib_del_ifaddr+0x15dd/0x1b90 net/ipv4/fib_frontend.c:1306
 fib_inetaddr_event+0xc9/0x310 net/ipv4/fib_frontend.c:1437
 notifier_call_chain kernel/notifier.c:83 [inline]
 blocking_notifier_call_chain+0xba/0x140 kernel/notifier.c:318
 __inet_del_ifa+0x81f/0xd90 net/ipv4/devinet.c:444
 inet_del_ifa net/ipv4/devinet.c:481 [inline]
 inetdev_destroy net/ipv4/devinet.c:321 [inline]
 inetdev_event+0x65a/0x10a0 net/ipv4/devinet.c:1613
 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]
 unregister_netdevice_many+0xfb8/0x1990 net/core/dev.c:11149
 default_device_exit_batch+0x330/0x390 net/core/dev.c:11682
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x602/0xad0 net/core/net_namespace.c:599
 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

Freed by task 25:
 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
 kvfree+0x35/0x40 mm/util.c:664
 __node_free_rcu+0x4c/0x80 net/ipv4/fib_trie.c:314
 rcu_do_batch+0x51d/0xba0 kernel/rcu/tree.c:2523
 rcu_core+0x5e4/0xf80 kernel/rcu/tree.c:2763
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
 handle_softirqs+0x250/0x560 kernel/softirq.c:565
 run_ksoftirqd+0x28/0x40 kernel/softirq.c:941
 smpboot_thread_fn+0x45a/0x8c0 kernel/smpboot.c:164
 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
 __call_rcu_common kernel/rcu/tree.c:3007 [inline]
 call_rcu+0xf6/0xf60 kernel/rcu/tree.c:3125
 tnode_free net/ipv4/fib_trie.c:495 [inline]
 replace+0x1b7/0x4c0 net/ipv4/fib_trie.c:521
 halve net/ipv4/fib_trie.c:678 [inline]
 resize+0x14a9/0x1c70 net/ipv4/fib_trie.c:891
 trie_rebalance net/ipv4/fib_trie.c:1101 [inline]
 fib_remove_alias+0x4f8/0x730 net/ipv4/fib_trie.c:1664
 fib_table_delete+0xfcb/0x1210 net/ipv4/fib_trie.c:1767
 fib_magic net/ipv4/fib_frontend.c:1095 [inline]
 fib_del_ifaddr+0x15dd/0x1b90 net/ipv4/fib_frontend.c:1306
 fib_inetaddr_event+0xc9/0x310 net/ipv4/fib_frontend.c:1437
 notifier_call_chain kernel/notifier.c:83 [inline]
 blocking_notifier_call_chain+0xba/0x140 kernel/notifier.c:318
 __inet_del_ifa+0x81f/0xd90 net/ipv4/devinet.c:444
 inet_del_ifa net/ipv4/devinet.c:481 [inline]
 inetdev_destroy net/ipv4/devinet.c:321 [inline]
 inetdev_event+0x65a/0x10a0 net/ipv4/devinet.c:1613
 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]
 unregister_netdevice_many+0xfb8/0x1990 net/core/dev.c:11149
 default_device_exit_batch+0x330/0x390 net/core/dev.c:11682
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x602/0xad0 net/core/net_namespace.c:599
 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

Second to 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]
 __cpu_map_entry_replace kernel/bpf/cpumap.c:555 [inline]
 cpu_map_free+0x1d1/0x2a0 kernel/bpf/cpumap.c:638
 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

The buggy address belongs to the object at ffff888116436600
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 24 bytes inside of
 192-byte region [ffff888116436600, ffff8881164366c0)
The buggy address belongs to the page:
page:ffffea0004590d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116436
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 0000000200000001 ffff888100042c00
raw: 0000000000000000 0000000000100010 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 104, ts 5389759065, 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
 kmalloc include/linux/slab.h:616 [inline]
 kzalloc include/linux/slab.h:747 [inline]
 kernfs_fop_open+0x343/0xb30 fs/kernfs/file.c:628
 do_dentry_open+0x834/0x1010 fs/open.c:828
 vfs_open+0x73/0x80 fs/open.c:958
 do_open fs/namei.c:3608 [inline]
 path_openat+0x2646/0x2f10 fs/namei.c:3742
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x14c/0x7b0 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1261
 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888116436500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888116436580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888116436600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888116436680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888116436700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================