================================================================== BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668 Read of size 8 at addr ffff0000d5ab3e00 by task kworker/1:14/7082 CPU: 1 PID: 7082 Comm: kworker/1:14 Not tainted 6.1.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: wg-crypt-wg0 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+0x3e8/0x6e0 net/core/filter.c:4475 do_xdp_generic+0x460/0x634 net/core/dev.c:4957 __netif_receive_skb_core+0x15d4/0x3788 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+0x7ac/0x1404 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 6279: 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+0xd8/0x1c4 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] inotify_handle_inode_event+0x2c0/0x8ec fs/notify/inotify/inotify_fsnotify.c:96 inotify_ignored_and_remove_idr+0x38/0x80 fs/notify/inotify/inotify_user.c:527 inotify_freeing_mark+0x28/0x38 fs/notify/inotify/inotify_fsnotify.c:140 fsnotify_free_mark fs/notify/mark.c:516 [inline] fsnotify_destroy_mark+0x1e4/0x35c fs/notify/mark.c:525 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:817 [inline] __se_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:794 [inline] __arm64_sys_inotify_rm_watch+0x160/0x220 fs/notify/inotify/inotify_user.c:794 __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 3912: 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 inotify_free_event+0x20/0x30 fs/notify/inotify/inotify_fsnotify.c:190 fsnotify_destroy_event+0x100/0x124 fs/notify/notification.c:67 inotify_read+0x470/0xa68 fs/notify/inotify/inotify_user.c:275 vfs_read+0x280/0x8b4 fs/read_write.c:468 ksys_read+0x15c/0x26c fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __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 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 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x804/0xa58 net/netfilter/core.c:445 nf_register_net_hook+0xc4/0x1a4 net/netfilter/core.c:566 nf_register_net_hooks+0x58/0x1b4 net/netfilter/core.c:582 nf_ct_netns_do_get+0x36c/0x558 net/netfilter/nf_conntrack_proto.c:482 nf_ct_netns_inet_get+0x2c/0x168 net/netfilter/nf_conntrack_proto.c:591 nf_ct_netns_get+0x4c/0xd8 net/netfilter/nf_conntrack_proto.c:613 nf_conncount_init+0x120/0x314 net/netfilter/nf_conncount.c:542 ovs_ct_limit_init net/openvswitch/conntrack.c:1902 [inline] ovs_ct_init+0x258/0x3b4 net/openvswitch/conntrack.c:2311 ovs_init_net+0x1e8/0x264 net/openvswitch/datapath.c:2607 ops_init+0x2e4/0x54c net/core/net_namespace.c:138 setup_net+0x46c/0xb88 net/core/net_namespace.c:336 copy_net_ns+0x2ec/0x58c net/core/net_namespace.c:508 create_new_namespaces+0x344/0x614 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226 ksys_unshare+0x424/0x7e4 kernel/fork.c:3201 __do_sys_unshare kernel/fork.c:3272 [inline] __se_sys_unshare kernel/fork.c:3270 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3270 __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 The buggy address belongs to the object at ffff0000d5ab3e00 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000d5ab3e00, ffff0000d5ab3e80) The buggy address belongs to the physical page: page:00000000b42355eb refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115ab3 memcg:ffff0000f3a5b501 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003361a00 dead000000000007 ffff0000c0002d80 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff0000f3a5b501 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d5ab3d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff0000d5ab3d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d5ab3e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d5ab3e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d5ab3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc 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