==================================================================
BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa0/0x6f0 kernel/bpf/devmap.c:667
Read of size 8 at addr ffff88811ccc7380 by task syz.4.13343/29834

CPU: 1 PID: 29834 Comm: syz.4.13343 Tainted: G        W         5.15.178-syzkaller-00193-g058abb720bd1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 dev_map_generic_redirect+0xa0/0x6f0 kernel/bpf/devmap.c:667
 xdp_do_generic_redirect_map net/core/filter.c:4177 [inline]
 xdp_do_generic_redirect+0x42e/0xb40 net/core/filter.c:4236
 do_xdp_generic+0x50b/0x7c0 net/core/dev.c:4919
 __netif_receive_skb_core+0x1706/0x3640 net/core/dev.c:5324
 __netif_receive_skb_one_core net/core/dev.c:5499 [inline]
 __netif_receive_skb+0x11c/0x530 net/core/dev.c:5615
 process_backlog+0x31c/0x650 net/core/dev.c:6492
 __napi_poll+0xc4/0x5a0 net/core/dev.c:7051
 napi_poll net/core/dev.c:7118 [inline]
 net_rx_action+0x47d/0xc50 net/core/dev.c:7208
 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565
 __do_softirq+0xb/0xd kernel/softirq.c:603
 do_softirq+0xf6/0x150 kernel/softirq.c:452
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379
 local_bh_enable+0x1f/0x30 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:818 [inline]
 ip_finish_output2+0xbef/0xf60 net/ipv4/ip_output.c:229
 __ip_finish_output+0x162/0x360
 ip_finish_output+0x31/0x210 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0x1d6/0x420 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:444 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0xb0/0x140 net/ipv4/ip_output.c:1581
 udp_send_skb+0x9ae/0x12e0 net/ipv4/udp.c:991
 udp_sendmsg+0x1d00/0x2aa0 net/ipv4/udp.c:1279
 inet_sendmsg+0xa1/0xc0 net/ipv4/af_inet.c:830
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490
 __sys_sendmmsg+0x2bf/0x530 net/socket.c:2576
 __do_sys_sendmmsg net/socket.c:2605 [inline]
 __se_sys_sendmmsg net/socket.c:2602 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2602
 x64_sys_call+0x81d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8c643ad169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8c62a17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f8c645c5fa0 RCX: 00007f8c643ad169
RDX: 0000000000000001 RSI: 0000400000003240 RDI: 0000000000000005
RBP: 00007f8c6442e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004000800 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8c645c5fa0 R15: 00007ffcd449adf8
 </TASK>

Allocated by task 27785:
 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+0xdb/0x110 mm/kasan/common.c:512
 __kasan_krealloc+0x93/0xd0 mm/kasan/common.c:580
 kasan_krealloc include/linux/kasan.h:247 [inline]
 __do_krealloc mm/slab_common.c:1234 [inline]
 krealloc+0xbe/0x110 mm/slab_common.c:1271
 push_jmp_history kernel/bpf/verifier.c:2119 [inline]
 is_state_visited kernel/bpf/verifier.c:11039 [inline]
 do_check+0x2633/0xf2c0 kernel/bpf/verifier.c:11179
 do_check_common+0x909/0x1290 kernel/bpf/verifier.c:13457
 do_check_main kernel/bpf/verifier.c:13520 [inline]
 bpf_check+0x3851/0x12c60 kernel/bpf/verifier.c:14091
 bpf_prog_load+0x12ac/0x1b50 kernel/bpf/syscall.c:2333
 __sys_bpf+0x4bc/0x760 kernel/bpf/syscall.c:4638
 __do_sys_bpf kernel/bpf/syscall.c:4742 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4740 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4740
 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0xf0 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+0x123/0x10b0 kernel/rcu/tree.c:3125
 release_probes kernel/tracepoint.c:164 [inline]
 tracepoint_remove_func kernel/tracepoint.c:458 [inline]
 tracepoint_probe_unregister+0x82b/0x900 kernel/tracepoint.c:551
 bpf_probe_unregister+0x61/0x70 kernel/trace/bpf_trace.c:1952
 bpf_raw_tp_link_release+0x63/0x90 kernel/bpf/syscall.c:2885
 bpf_link_free+0x129/0x3f0 kernel/bpf/syscall.c:2451
 bpf_link_put kernel/bpf/syscall.c:2477 [inline]
 bpf_link_release+0x170/0x180 kernel/bpf/syscall.c:2485
 __fput+0x228/0x8c0 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:308
 task_work_run+0x129/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 insert_work+0x56/0x320 kernel/workqueue.c:1373
 __queue_work+0x92a/0xcd0 kernel/workqueue.c:1539
 queue_work_on+0x105/0x170 kernel/workqueue.c:1566
 queue_work include/linux/workqueue.h:510 [inline]
 schedule_work include/linux/workqueue.h:571 [inline]
 nf_nat_masq_schedule+0x4d6/0x620 net/netfilter/nf_nat_masquerade.c:125
 masq_inet6_event+0x124/0x180 net/netfilter/nf_nat_masquerade.c:290
 notifier_call_chain kernel/notifier.c:83 [inline]
 atomic_notifier_call_chain+0x95/0x100 kernel/notifier.c:198
 inet6addr_notifier_call_chain+0x24/0x30 net/ipv6/addrconf_core.c:109
 addrconf_ifdown+0xe21/0x1ae0 net/ipv6/addrconf.c:3923
 addrconf_notify+0x37d/0xdd0
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391
 call_netdevice_notifiers_info net/core/dev.c:2026 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2038 [inline]
 call_netdevice_notifiers net/core/dev.c:2052 [inline]
 dev_close_many+0x37c/0x530 net/core/dev.c:1627
 unregister_netdevice_many+0x492/0x17c0 net/core/dev.c:11094
 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:11051
 unregister_netdevice include/linux/netdevice.h:3052 [inline]
 __tun_detach+0xd14/0x1510 drivers/net/tun.c:686
 tun_detach drivers/net/tun.c:702 [inline]
 tun_chr_close+0x92/0x140 drivers/net/tun.c:3440
 __fput+0x228/0x8c0 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:308
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 get_signal+0x7a3/0x1630 kernel/signal.c:2907
 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88811ccc7380
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff88811ccc7380, ffff88811ccc73e0)
The buggy address belongs to the page:
page:ffffea00047331c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811ccc7e00 pfn:0x11ccc7
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004c5b0c8 ffffea00045c1d88 ffff888100042900
raw: ffff88811ccc7e00 000000000020000e 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 26, ts 21544441390, free_ts 21433423164
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc_trace+0x147/0x270 mm/slub.c:3267
 kmalloc include/linux/slab.h:603 [inline]
 dst_cow_metrics_generic+0x55/0x1c0 net/core/dst.c:206
 dst_metrics_write_ptr include/net/dst.h:118 [inline]
 dst_metric_set include/net/dst.h:179 [inline]
 icmp6_dst_alloc+0x385/0x560 net/ipv6/route.c:3288
 ndisc_send_skb+0x27f/0xc90 net/ipv6/ndisc.c:491
 ndisc_send_ns+0x64d/0x830 net/ipv6/ndisc.c:653
 addrconf_dad_work+0xb29/0x1710 net/ipv6/addrconf.c:4221
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
 kthread+0x421/0x510 kernel/kthread.c:337
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+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5856
 free_pages+0x7c/0x90 mm/page_alloc.c:5867
 kasan_depopulate_vmalloc_pte+0x6a/0x90 mm/kasan/shadow.c:354
 apply_to_pte_range mm/memory.c:2642 [inline]
 apply_to_pmd_range mm/memory.c:2686 [inline]
 apply_to_pud_range mm/memory.c:2722 [inline]
 apply_to_p4d_range mm/memory.c:2758 [inline]
 __apply_to_page_range+0x8dd/0xbe0 mm/memory.c:2792
 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2825
 kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:464
 __purge_vmap_area_lazy+0x154a/0x1690 mm/vmalloc.c:1715
 _vm_unmap_aliases+0x339/0x3b0 mm/vmalloc.c:2118
 vm_unmap_aliases+0x19/0x20 mm/vmalloc.c:2141
 change_page_attr_set_clr+0x308/0x1050 arch/x86/mm/pat/set_memory.c:1740
 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline]
 set_memory_ro+0xa1/0xe0 arch/x86/mm/pat/set_memory.c:1943
 bpf_jit_binary_lock_ro include/linux/filter.h:892 [inline]
 bpf_int_jit_compile+0xbf21/0xc6b0 arch/x86/net/bpf_jit_comp.c:2422
 bpf_prog_select_runtime+0x724/0xa10 kernel/bpf/core.c:1934
 bpf_migrate_filter net/core/filter.c:1299 [inline]
 bpf_prepare_filter+0x10d0/0x13d0 net/core/filter.c:1347

Memory state around the buggy address:
 ffff88811ccc7280: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88811ccc7300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff88811ccc7380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff88811ccc7400: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
 ffff88811ccc7480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
ip6_tunnel: ip6gretap0 xmit: Local address not yet configured!