================================================================== 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+0x88e/0x3200 net/sched/cls_api.c:3633 Read of size 8 at addr ffff888116936fc0 by task syz.0.2860/8847 CPU: 0 PID: 8847 Comm: syz.0.2860 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x10f/0x150 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+0x88e/0x3200 net/sched/cls_api.c:3633 mall_replace_hw_filter+0x2db/0x8d0 net/sched/cls_matchall.c:100 mall_change+0x544/0x760 net/sched/cls_matchall.c:235 tc_new_tfilter+0x13df/0x1990 net/sched/cls_api.c:2138 rtnetlink_rcv_msg+0x83c/0xcb0 net/core/rtnetlink.c:5644 netlink_rcv_skb+0x1e9/0x430 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+0x86c/0xa30 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+0x5be/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+0x201/0x2d0 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: 0033:0x7f02d9246e59 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:00007f02d7ca0028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f02d94cefa0 RCX: 00007f02d9246e59 RDX: 0000000020044044 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f02d92dce6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f02d94cf038 R14: 00007f02d94cefa0 R15: 00007ffc9285efe8 Allocated by task 8847: 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+0xd4/0x100 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+0x3fd/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+0x13df/0x1990 net/sched/cls_api.c:2138 rtnetlink_rcv_msg+0x83c/0xcb0 net/core/rtnetlink.c:5644 netlink_rcv_skb+0x1e9/0x430 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+0x86c/0xa30 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+0x5be/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+0x201/0x2d0 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 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf60 kernel/rcu/tree.c:3129 neigh_parms_release+0x1da/0x220 net/core/neighbour.c:1674 addrconf_ifdown+0x1673/0x1910 net/ipv6/addrconf.c:3953 addrconf_notify+0x3bd/0xe00 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+0x103d/0x1a00 net/core/dev.c:11176 xfrmi_exit_batch_net+0x20a/0x260 net/xfrm/xfrm_interface_core.c:766 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x605/0xae0 net/core/net_namespace.c:599 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 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 kvfree_call_rcu+0xb6/0x860 kernel/rcu/tree.c:3648 br_multicast_destroy_mdb_entry+0x90/0xb0 net/bridge/br_multicast.c:609 br_multicast_gc net/bridge/br_multicast.c:775 [inline] br_multicast_gc_work+0x1b9/0x230 net/bridge/br_multicast.c:3913 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888116936f00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff888116936f00, ffff888116936fc0) The buggy address belongs to the page: page:ffffea00045a4d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888116936000 pfn:0x116936 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00042b0f80 0000000600000006 ffff888100042c00 raw: ffff888116936000 000000008010000d 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 111, ts 5440357122, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 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] kernfs_fop_open+0x375/0xbb0 fs/kernfs/file.c:628 do_dentry_open+0x82a/0x1010 fs/open.c:828 vfs_open+0x73/0x80 fs/open.c:960 do_open fs/namei.c:3616 [inline] path_openat+0x26e6/0x2f80 fs/namei.c:3750 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_openat fs/open.c:1268 [inline] __se_sys_openat fs/open.c:1263 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1263 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 page_owner free stack trace missing Memory state around the buggy address: ffff888116936e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888116936f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888116936f80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888116937000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888116937080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================