================================================================== 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 ffff88810ca975c0 by task syz.5.152/872 CPU: 1 PID: 872 Comm: syz.5.152 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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:5645 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2516 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5672 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:1927 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2526 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: 0033:0x7f8647a7a019 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:00007f86464d3028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8647d01fa0 RCX: 00007f8647a7a019 RDX: 0000000020000000 RSI: 0000200000000040 RDI: 0000000000000004 RBP: 00007f8647b1100c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8647d02038 R14: 00007f8647d01fa0 R15: 00007ffd5e2c95c8 Allocated by task 872: 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:5645 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2516 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5672 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:1927 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2526 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+0xb6/0x860 kernel/rcu/tree.c:3648 ip_ma_put+0xf7/0x140 net/ipv4/igmp.c:171 __ip_mc_dec_group+0x464/0x540 net/ipv4/igmp.c:1697 ip_mc_dec_group include/linux/igmp.h:135 [inline] ip_mc_down+0x1b0/0x240 net/ipv4/igmp.c:1752 inetdev_event+0x2b2/0x1060 net/ipv4/devinet.c:1598 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] dev_close_many+0x325/0x4d0 net/core/dev.c:1671 unregister_netdevice_many+0x477/0x1a00 net/core/dev.c:11152 default_device_exit_batch+0x35e/0x3c0 net/core/dev.c:11709 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 The buggy address belongs to the object at ffff88810ca97500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff88810ca97500, ffff88810ca975c0) The buggy address belongs to the page: page:ffffea000432a5c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ca97 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 0000000500000001 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 4318944399, 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] __kmalloc+0x16a/0x2c0 mm/slub.c:4432 kmalloc_array include/linux/slab.h:659 [inline] kcalloc include/linux/slab.h:688 [inline] security_get_permissions+0xa1/0x370 security/selinux/ss/services.c:3475 sel_make_perm_files security/selinux/selinuxfs.c:1876 [inline] sel_make_class_dir_entries security/selinux/selinuxfs.c:1937 [inline] sel_make_classes security/selinux/selinuxfs.c:1968 [inline] sel_make_policy_nodes+0xd8e/0x1350 security/selinux/selinuxfs.c:572 sel_write_load+0x3dc/0x600 security/selinux/selinuxfs.c:652 vfs_write+0x404/0xfd0 fs/read_write.c:592 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 page_owner free stack trace missing Memory state around the buggy address: ffff88810ca97480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88810ca97500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810ca97580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88810ca97600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810ca97680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================