================================================================== 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+0xb9d/0x3430 net/sched/cls_api.c:3625 Read of size 8 at addr ffff888127b1d9c0 by task syz.0.2847/9094 CPU: 1 PID: 9094 Comm: syz.0.2847 Not tainted 5.15.178-syzkaller-00034-g5e1b899f19c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __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 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] tc_setup_flow_action+0xb9d/0x3430 net/sched/cls_api.c:3625 mall_replace_hw_filter+0x394/0xc20 net/sched/cls_matchall.c:100 mall_change+0x56e/0x780 net/sched/cls_matchall.c:235 tc_new_tfilter+0x151a/0x1c00 net/sched/cls_api.c:2131 rtnetlink_rcv_msg+0x776/0xc40 net/core/rtnetlink.c:5638 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5665 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341 netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909 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_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7f3fb670d169 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:00007f3fb4d77038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3fb6925fa0 RCX: 00007f3fb670d169 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f3fb678e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3fb6925fa0 R15: 00007ffd4f84ee28 Allocated by task 9094: 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_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13f/0x2c0 mm/slub.c:4431 kmalloc include/linux/slab.h:608 [inline] kzalloc include/linux/slab.h:733 [inline] tcf_idr_create+0x5f/0x780 net/sched/act_api.c:478 tcf_idr_create_from_flags+0x5f/0x70 net/sched/act_api.c:536 tcf_gact_init+0x3cd/0x6e0 net/sched/act_gact.c:102 tcf_action_init_1+0x50f/0x7f0 net/sched/act_api.c:1071 tcf_action_init+0x306/0x840 net/sched/act_api.c:1130 tcf_exts_validate+0x236/0x520 net/sched/cls_api.c:3073 mall_set_parms+0x44/0x4b0 net/sched/cls_matchall.c:171 mall_change+0x495/0x780 net/sched/cls_matchall.c:229 tc_new_tfilter+0x151a/0x1c00 net/sched/cls_api.c:2131 rtnetlink_rcv_msg+0x776/0xc40 net/core/rtnetlink.c:5638 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5665 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341 netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909 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_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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 neigh_parms_release+0x1e1/0x220 net/core/neighbour.c:1674 addrconf_ifdown+0x1844/0x1ae0 net/ipv6/addrconf.c:3952 addrconf_notify+0x37d/0xdd0 net/ipv6/addrconf.c:-1 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] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11118 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:11051 unregister_netdevice include/linux/netdevice.h:3049 [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:311 ____fput+0x15/0x20 fs/file_table.c:339 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 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125 neigh_parms_release+0x1e1/0x220 net/core/neighbour.c:1674 inetdev_destroy net/ipv4/devinet.c:328 [inline] inetdev_event+0x7e8/0x10a0 net/ipv4/devinet.c:1612 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] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11118 ip6gre_exit_batch_net+0x5b2/0x600 net/ipv6/ip6_gre.c:1650 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:599 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888127b1d900 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff888127b1d900, ffff888127b1d9c0) The buggy address belongs to the page: page:ffffea00049ec740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127b1d flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004313ec0 0000000500000005 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 298, ts 30811947525, free_ts 0 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 alloc_slab_page mm/slub.c:-1 [inline] 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] kzalloc include/linux/slab.h:733 [inline] ____ip_mc_inc_group+0x215/0x8d0 net/ipv4/igmp.c:1452 __ip_mc_inc_group net/ipv4/igmp.c:1487 [inline] ip_mc_inc_group net/ipv4/igmp.c:1493 [inline] ip_mc_up+0x10f/0x1e0 net/ipv4/igmp.c:1792 inetdev_event+0xc45/0x10a0 net/ipv4/devinet.c:1587 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391 __dev_notify_flags+0x304/0x610 net/core/dev.c:-1 dev_change_flags+0xf0/0x1a0 net/core/dev.c:8905 do_setlink+0xc21/0x3d80 net/core/rtnetlink.c:2776 __rtnl_newlink net/core/rtnetlink.c:3447 [inline] rtnl_newlink+0x17bc/0x2050 net/core/rtnetlink.c:3569 page_owner free stack trace missing Memory state around the buggy address: ffff888127b1d880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888127b1d900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888127b1d980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888127b1da00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888127b1da80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================