netlink: 12 bytes leftover after parsing attributes in process `syz.5.3788'. netlink: 12 bytes leftover after parsing attributes in process `syz.5.3788'. ================================================================== 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+0x842/0x3280 net/sched/cls_api.c:3639 Read of size 8 at addr ffff888123d092c0 by task syz.5.3788/12909 CPU: 1 PID: 12909 Comm: syz.5.3788 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __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+0x842/0x3280 net/sched/cls_api.c:3639 mall_replace_hw_filter+0x293/0x810 net/sched/cls_matchall.c:100 mall_change+0x528/0x750 net/sched/cls_matchall.c:236 tc_new_tfilter+0x13f6/0x1a10 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x800/0xb90 net/core/rtnetlink.c:5601 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f7c5b411be9 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:00007f7c59e7a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7c5b648fa0 RCX: 00007f7c5b411be9 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f7c5b494e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7c5b649038 R14: 00007f7c5b648fa0 R15: 00007fffc3f88728 Allocated by task 12909: 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:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a7/0x330 mm/slub.c:4033 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] tcf_idr_create+0x5f/0x790 net/sched/act_api.c:430 tcf_idr_create_from_flags+0x61/0x70 net/sched/act_api.c:488 tcf_gact_init+0x2b4/0x520 net/sched/act_gact.c:102 tcf_action_init_1+0x3e1/0x670 net/sched/act_api.c:1052 tcf_action_init+0x1e6/0x700 net/sched/act_api.c:1109 tcf_exts_validate+0x215/0x510 net/sched/cls_api.c:3086 mall_set_parms+0x4b/0x410 net/sched/cls_matchall.c:171 mall_change+0x45c/0x750 net/sched/cls_matchall.c:230 tc_new_tfilter+0x13f6/0x1a10 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x800/0xb90 net/core/rtnetlink.c:5601 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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 kernel/rcu/tree.c:2980 [inline] call_rcu+0x10e/0x1050 kernel/rcu/tree.c:3054 neigh_parms_release+0x1cb/0x200 net/core/neighbour.c:1682 addrconf_ifdown+0x15bb/0x1800 net/ipv6/addrconf.c:3941 addrconf_notify+0x3bd/0xe90 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers net/core/dev.c:2080 [inline] unregister_netdevice_many+0xf8b/0x1980 net/core/dev.c:10767 sit_exit_batch_net+0x607/0x650 net/ipv6/sit.c:1943 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x5fb/0xb70 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 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 kvfree_call_rcu+0x10c/0x620 kernel/rcu/tree.c:3539 drop_sysctl_table+0x2ef/0x410 fs/proc/proc_sysctl.c:1684 unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1722 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:127 nf_ct_frags6_sysctl_unregister net/ipv6/netfilter/nf_conntrack_reasm.c:115 [inline] nf_ct_net_exit+0x60/0xb0 net/ipv6/netfilter/nf_conntrack_reasm.c:521 ops_exit_list net/core/net_namespace.c:185 [inline] cleanup_net+0x586/0xb70 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff888123d09200 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff888123d09200, ffff888123d092c0) The buggy address belongs to the page: page:ffffea00048f4240 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123d09 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100043380 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 267, ts 171254271803, free_ts 171245832968 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5357 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x84/0x3f0 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc_trace+0x1b3/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] br_multicast_new_group+0x120/0x370 net/bridge/br_multicast.c:1047 __br_multicast_add_group+0x107/0x730 net/bridge/br_multicast.c:1239 br_multicast_add_group net/bridge/br_multicast.c:1287 [inline] br_ip6_multicast_add_group net/bridge/br_multicast.c:1339 [inline] br_ip6_multicast_mld2_report net/bridge/br_multicast.c:2426 [inline] br_multicast_ipv6_rcv net/bridge/br_multicast.c:3124 [inline] br_multicast_rcv+0x2b29/0x4f30 net/bridge/br_multicast.c:3159 br_handle_frame_finish+0x378/0x1180 net/bridge/br_input.c:112 nf_hook_bridge_pre net/bridge/br_input.c:259 [inline] br_handle_frame+0x407/0x8e0 net/bridge/br_input.c:363 __netif_receive_skb_core+0xe95/0x2f90 net/core/dev.c:5296 __netif_receive_skb_one_core net/core/dev.c:5400 [inline] __netif_receive_skb+0x72/0x280 net/core/dev.c:5516 process_backlog+0x368/0x600 net/core/dev.c:6423 napi_poll net/core/dev.c:6874 [inline] net_rx_action+0x432/0xdd0 net/core/dev.c:6944 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page mm/page_alloc.c:5416 [inline] __free_pages+0x14b/0x380 mm/page_alloc.c:5427 __vunmap+0x84d/0x9d0 mm/vmalloc.c:2301 __vfree mm/vmalloc.c:2350 [inline] vfree+0x61/0x90 mm/vmalloc.c:2381 bpf_prog_calc_tag+0x5bc/0x6d0 kernel/bpf/core.c:343 resolve_pseudo_ldimm64+0xc9/0x1020 kernel/bpf/verifier.c:10574 bpf_check+0x8d4b/0xd680 kernel/bpf/verifier.c:12667 bpf_prog_load+0xf5a/0x1420 kernel/bpf/syscall.c:2234 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline] __se_sys_bpf+0x442/0x680 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888123d09180: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888123d09200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888123d09280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888123d09300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888123d09380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================