================================================================== BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668 Read of size 8 at addr ffff0000f3e39d00 by task kworker/0:4/4343 CPU: 0 PID: 4343 Comm: kworker/0:4 Not tainted 6.1.129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: wg-crypt-wg1 wg_packet_tx_worker Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668 xdp_do_generic_redirect_map net/core/filter.c:4416 [inline] xdp_do_generic_redirect+0x3ec/0x6e4 net/core/filter.c:4475 do_xdp_generic+0x460/0x634 net/core/dev.c:4957 __netif_receive_skb_core+0x15d4/0x378c net/core/dev.c:5359 __netif_receive_skb_one_core net/core/dev.c:5536 [inline] __netif_receive_skb+0x114/0x400 net/core/dev.c:5652 process_backlog+0x410/0x784 net/core/dev.c:5980 __napi_poll+0xb4/0x3f0 net/core/dev.c:6547 napi_poll net/core/dev.c:6614 [inline] net_rx_action+0x5cc/0xd3c net/core/dev.c:6728 handle_softirqs+0x318/0xd58 kernel/softirq.c:578 __do_softirq+0x14/0x20 kernel/softirq.c:612 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 do_softirq+0xf8/0x1ac kernel/softirq.c:479 __local_bh_enable_ip+0x298/0x470 kernel/softirq.c:403 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline] _raw_read_unlock_bh+0x48/0x58 kernel/locking/spinlock.c:284 wg_socket_send_skb_to_peer+0x158/0x1a8 drivers/net/wireguard/socket.c:184 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1a8/0x718 drivers/net/wireguard/send.c:276 process_one_work+0x804/0x1484 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 9980: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xe0/0x1d0 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] bpf_map_kmalloc_node+0x21c/0x610 kernel/bpf/syscall.c:452 __dev_map_alloc_node+0x70/0x448 kernel/bpf/devmap.c:851 __dev_map_update_elem kernel/bpf/devmap.c:916 [inline] dev_map_update_elem+0x1a8/0x388 kernel/bpf/devmap.c:935 bpf_map_update_value+0x5e8/0x844 kernel/bpf/syscall.c:226 map_update_elem+0x538/0x6b8 kernel/bpf/syscall.c:1463 __sys_bpf+0x2dc/0x654 kernel/bpf/syscall.c:5013 __do_sys_bpf kernel/bpf/syscall.c:5129 [inline] __se_sys_bpf kernel/bpf/syscall.c:5127 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5127 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4947: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:988 dev_map_free+0x4a4/0x5f0 kernel/bpf/devmap.c:238 bpf_map_free_deferred+0xbc/0xd0 kernel/bpf/syscall.c:635 process_one_work+0x804/0x1484 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2845 inet_free_ifa net/ipv4/devinet.c:234 [inline] inetdev_destroy net/ipv4/devinet.c:324 [inline] inetdev_event+0x458/0x1308 net/ipv4/devinet.c:1616 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1970 [inline] call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] unregister_netdevice_many+0xe68/0x1798 net/core/dev.c:10947 default_device_exit_batch+0xa10/0xaa8 net/core/dev.c:11460 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x6b8/0xaec net/core/net_namespace.c:640 process_one_work+0x804/0x1484 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 The buggy address belongs to the object at ffff0000f3e39d00 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000f3e39d00, ffff0000f3e39d80) The buggy address belongs to the physical page: page:00000000225dc9d6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x133e39 memcg:ffff0000c319f001 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc00032700c0 dead000000000003 ffff0000c0002d80 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff0000c319f001 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f3e39c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff0000f3e39c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f3e39d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f3e39d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f3e39e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ==================================================================