==================================================================
BUG: KASAN: use-after-free in dev_map_generic_redirect+0x9f/0x7d0 kernel/bpf/devmap.c:668
Read of size 8 at addr ffff8881194ba600 by task kworker/0:1/19

CPU: 0 PID: 19 Comm: kworker/0:1 Not tainted 6.1.128-syzkaller-00006-g9bcabbda673a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
 dev_map_generic_redirect+0x9f/0x7d0 kernel/bpf/devmap.c:668
 xdp_do_generic_redirect_map net/core/filter.c:4415 [inline]
 xdp_do_generic_redirect+0x42e/0xb40 net/core/filter.c:4474
 do_xdp_generic+0x53e/0x800 net/core/dev.c:4968
 __netif_receive_skb_core+0x19ae/0x43d0 net/core/dev.c:5375
 __netif_receive_skb_one_core net/core/dev.c:5552 [inline]
 __netif_receive_skb+0x11c/0x530 net/core/dev.c:5668
 process_backlog+0x32c/0x630 net/core/dev.c:5996
 __napi_poll+0xbe/0x5c0 net/core/dev.c:6563
 napi_poll net/core/dev.c:6630 [inline]
 net_rx_action+0x595/0xdd0 net/core/dev.c:6744
 handle_softirqs+0x1db/0x650 kernel/softirq.c:624
 __do_softirq+0xb/0xd kernel/softirq.c:662
 do_softirq+0xf6/0x150 kernel/softirq.c:506
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:430
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline]
 _raw_read_unlock_bh+0x29/0x30 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x178/0x1d0 drivers/net/wireguard/socket.c:184
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1d7/0x520 drivers/net/wireguard/send.c:276
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 1408:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 tnode_alloc net/ipv4/fib_trie.c:332 [inline]
 tnode_new+0xca/0x2e0 net/ipv4/fib_trie.c:385
 inflate net/ipv4/fib_trie.c:545 [inline]
 resize+0x2d0/0x1d60 net/ipv4/fib_trie.c:869
 trie_rebalance net/ipv4/fib_trie.c:1106 [inline]
 fib_insert_node net/ipv4/fib_trie.c:1150 [inline]
 fib_insert_alias+0xb20/0x1060 net/ipv4/fib_trie.c:1164
 fib_table_insert+0xa01/0x20a0 net/ipv4/fib_trie.c:1378
 fib_magic net/ipv4/fib_frontend.c:1104 [inline]
 fib_add_ifaddr+0x43f/0x15e0 net/ipv4/fib_frontend.c:1126
 fib_inetaddr_event+0x159/0x310 net/ipv4/fib_frontend.c:1440
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:382
 __inet_insert_ifa+0x8fb/0xb10 net/ipv4/devinet.c:569
 inet_rtm_newaddr+0x8f7/0x1780 net/ipv4/devinet.c:971
 rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2503
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1860
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 __sys_sendto+0x480/0x600 net/socket.c:2143
 __do_sys_sendto net/socket.c:2155 [inline]
 __se_sys_sendto net/socket.c:2151 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:2151
 x64_sys_call+0x15c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 60:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1745 [inline]
 slab_free_freelist_hook mm/slub.c:1771 [inline]
 slab_free mm/slub.c:3686 [inline]
 __kmem_cache_free+0x21d/0x410 mm/slub.c:3702
 kfree+0x7a/0xf0 mm/slab_common.c:990
 kvfree+0x35/0x40 mm/util.c:639
 __node_free_rcu+0x49/0x80 net/ipv4/fib_trie.c:315
 rcu_do_batch+0x552/0xbe0 kernel/rcu/tree.c:2297
 rcu_core+0x502/0xf40 kernel/rcu/tree.c:2557
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2574
 handle_softirqs+0x1db/0x650 kernel/softirq.c:624
 __do_softirq+0xb/0xd kernel/softirq.c:662

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 __call_rcu_common kernel/rcu/tree.c:2807 [inline]
 call_rcu+0xdc/0x10f0 kernel/rcu/tree.c:2926
 tnode_free net/ipv4/fib_trie.c:496 [inline]
 replace+0x19b/0x4b0 net/ipv4/fib_trie.c:522
 inflate net/ipv4/fib_trie.c:624 [inline]
 resize+0xbaf/0x1d60 net/ipv4/fib_trie.c:869
 trie_rebalance net/ipv4/fib_trie.c:1106 [inline]
 fib_insert_node net/ipv4/fib_trie.c:1150 [inline]
 fib_insert_alias+0xb20/0x1060 net/ipv4/fib_trie.c:1164
 fib_table_insert+0xa01/0x20a0 net/ipv4/fib_trie.c:1378
 fib_magic net/ipv4/fib_frontend.c:1104 [inline]
 fib_add_ifaddr+0x43f/0x15e0 net/ipv4/fib_frontend.c:1126
 fib_inetaddr_event+0x159/0x310 net/ipv4/fib_frontend.c:1440
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:382
 __inet_insert_ifa+0x8fb/0xb10 net/ipv4/devinet.c:569
 inet_rtm_newaddr+0x8f7/0x1780 net/ipv4/devinet.c:971
 rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2503
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1860
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 __sys_sendto+0x480/0x600 net/socket.c:2143
 __do_sys_sendto net/socket.c:2155 [inline]
 __se_sys_sendto net/socket.c:2151 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:2151
 x64_sys_call+0x15c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 kvfree_call_rcu+0x9f/0x800 kernel/rcu/tree.c:3445
 kernfs_unlink_open_file+0x327/0x3d0 fs/kernfs/file.c:635
 kernfs_fop_release+0x253/0x310 fs/kernfs/file.c:807
 __fput+0x1e5/0x870 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x24d/0x2e0 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff8881194ba600
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff8881194ba600, ffff8881194ba660)

The buggy address belongs to the physical page:
page:ffffea0004652e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1194ba
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00044ed740 dead000000000005 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 114, tgid 114 (udevd), ts 4965230062, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2637
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2644
 get_page_from_freelist+0x3a98/0x3b10 mm/page_alloc.c:4539
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5837
 alloc_slab_page+0x6c/0xf0
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x90/0x3e0 mm/slub.c:2015
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
 __slab_alloc+0x5d/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x207/0x2a0 mm/slub.c:3462
 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 kernfs_get_open_node fs/kernfs/file.c:574 [inline]
 kernfs_fop_open+0x70e/0xb10 fs/kernfs/file.c:742
 do_dentry_open+0x891/0x1250 fs/open.c:884
 vfs_open+0x73/0x80 fs/open.c:1015
 do_open fs/namei.c:3625 [inline]
 path_openat+0x2532/0x2d60 fs/namei.c:3782
 do_filp_open+0x230/0x480 fs/namei.c:3809
 do_sys_openat2+0x151/0x870 fs/open.c:1341
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881194ba500: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8881194ba580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8881194ba600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff8881194ba680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8881194ba700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================