================================================================== BUG: KASAN: slab-out-of-bounds in is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] BUG: KASAN: slab-out-of-bounds in tc_setup_flow_action+0x870/0x3240 net/sched/cls_api.c:3633 Read of size 8 at addr ffff8881291063c0 by task syz.1.5498/18218 CPU: 0 PID: 18218 Comm: syz.1.5498 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 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 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] tc_setup_flow_action+0x870/0x3240 net/sched/cls_api.c:3633 mall_replace_hw_filter+0x2cc/0x8b0 net/sched/cls_matchall.c:100 mall_change+0x544/0x760 net/sched/cls_matchall.c:235 tc_new_tfilter+0x142f/0x19b0 net/sched/cls_api.c:2138 rtnetlink_rcv_msg+0x871/0xce0 net/core/rtnetlink.c:5644 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5671 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489 __sys_sendmsg net/socket.c:2518 [inline] __do_sys_sendmsg net/socket.c:2527 [inline] __se_sys_sendmsg net/socket.c:2525 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3aef408e59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3aede63028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3aef681fa0 RCX: 00007f3aef408e59 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f3aef49ed6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3aef682038 R14: 00007f3aef681fa0 R15: 00007fff3b58dad8 Allocated by task 18218: 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:4436 kmalloc include/linux/slab.h:624 [inline] kzalloc include/linux/slab.h:750 [inline] tcf_idr_create+0x5f/0x790 net/sched/act_api.c:478 tcf_idr_create_from_flags+0x61/0x70 net/sched/act_api.c:536 tcf_gact_init+0x342/0x570 net/sched/act_gact.c:102 tcf_action_init_1+0x3ff/0x6b0 net/sched/act_api.c:1071 tcf_action_init+0x233/0x7a0 net/sched/act_api.c:1130 tcf_exts_validate+0x24a/0x580 net/sched/cls_api.c:3081 mall_set_parms+0x48/0x520 net/sched/cls_matchall.c:171 mall_change+0x478/0x760 net/sched/cls_matchall.c:229 tc_new_tfilter+0x142f/0x19b0 net/sched/cls_api.c:2138 rtnetlink_rcv_msg+0x871/0xce0 net/core/rtnetlink.c:5644 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5671 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489 __sys_sendmsg net/socket.c:2518 [inline] __do_sys_sendmsg net/socket.c:2527 [inline] __se_sys_sendmsg net/socket.c:2525 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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 kvfree_call_rcu+0xb6/0x840 kernel/rcu/tree.c:3648 drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1687 unregister_sysctl_table+0x7a/0x120 fs/proc/proc_sysctl.c:1725 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 lowpan_frags_ns_sysctl_unregister net/ieee802154/6lowpan/reassembly.c:402 [inline] lowpan_frags_exit_net+0x60/0xb0 net/ieee802154/6lowpan/reassembly.c:475 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x593/0xae0 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 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf80 kernel/rcu/tree.c:3129 neigh_parms_release+0x1dd/0x220 net/core/neighbour.c:1674 addrconf_ifdown+0x1630/0x18d0 net/ipv6/addrconf.c:3953 addrconf_notify+0x3bd/0xde0 net/ipv6/addrconf.c:-1 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:2070 [inline] call_netdevice_notifiers_extack net/core/dev.c:2082 [inline] call_netdevice_notifiers net/core/dev.c:2096 [inline] unregister_netdevice_many+0x10a1/0x1aa0 net/core/dev.c:11176 ip_tunnel_delete_nets+0x34b/0x3a0 net/ipv4/ip_tunnel.c:1123 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1718 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x60a/0xae0 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 The buggy address belongs to the object at ffff888129106300 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff888129106300, ffff8881291063c0) The buggy address belongs to the page: page:ffffea0004a44180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x129106 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100042c00 raw: 0000000000000000 0000000080100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 14916, ts 1108476862698, free_ts 1108295411740 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+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3272 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] kset_create lib/kobject.c:982 [inline] kset_create_and_add+0x59/0x2c0 lib/kobject.c:1025 register_queue_kobjects net/core/net-sysfs.c:1759 [inline] netdev_register_kobject+0x1ec/0x360 net/core/net-sysfs.c:2018 register_netdevice+0xe85/0x1460 net/core/dev.c:10431 register_netdev+0x3e/0x50 net/core/dev.c:10555 ip6_tnl_init_net+0x2e4/0x3a0 net/ipv6/ip6_tunnel.c:2290 ops_init+0x1ba/0x4a0 net/core/net_namespace.c:138 setup_net+0x34d/0xaa0 net/core/net_namespace.c:332 copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:476 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+0x542/0x550 mm/page_alloc.c:3534 free_unref_page_list+0x13a/0x9d0 mm/page_alloc.c:3671 release_pages+0x1006/0x1060 mm/swap.c:1015 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x17e/0x310 mm/mmu_gather.c:338 exit_mmap+0x43b/0x8b0 mm/mmap.c:3248 __mmput+0x93/0x320 kernel/fork.c:1180 mmput+0x50/0x150 kernel/fork.c:1203 exit_mm kernel/exit.c:555 [inline] do_exit+0xa89/0x2890 kernel/exit.c:877 __do_sys_exit kernel/exit.c:973 [inline] __se_sys_exit kernel/exit.c:971 [inline] __ia32_sys_exit+0x0/0x40 kernel/exit.c:971 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888129106280: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888129106300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888129106380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888129106400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888129106480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================