================================================================== 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 ffff888126b0a9c0 by task syz.3.1559/5849 CPU: 1 PID: 5849 Comm: syz.3.1559 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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: 0033:0x7f039ad096c9 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:00007f0399771038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f039af5ffa0 RCX: 00007f039ad096c9 RDX: 0000000000008000 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f039ad8bf91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f039af60038 R14: 00007f039af5ffa0 R15: 00007ffd93024388 Allocated by task 5849: 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:4038 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 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x624/0x770 net/netfilter/core.c:419 nf_register_net_hook+0xbb/0x1a0 net/netfilter/core.c:536 nf_register_net_hooks+0x47/0x1b0 net/netfilter/core.c:552 ipt_register_table+0x20f/0x4b0 net/ipv4/netfilter/ip_tables.c:1756 iptable_security_table_init+0x7b/0xa0 net/ipv4/netfilter/iptable_security.c:59 xt_find_table_lock+0x251/0x3f0 net/netfilter/x_tables.c:1219 xt_request_find_table_lock+0x27/0x100 net/netfilter/x_tables.c:1249 get_info net/ipv4/netfilter/ip_tables.c:964 [inline] do_ipt_get_ctl+0x6dc/0x1060 net/ipv4/netfilter/ip_tables.c:1660 nf_getsockopt+0x26d/0x290 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x1040/0x1480 net/ipv4/ip_sockglue.c:1797 tcp_getsockopt+0x1c9/0x1df0 net/ipv4/tcp.c:4044 sock_common_getsockopt+0x98/0xb0 net/core/sock.c:3295 __sys_getsockopt+0x201/0x370 net/socket.c:2187 __do_sys_getsockopt net/socket.c:2202 [inline] __se_sys_getsockopt net/socket.c:2199 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2199 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888126b0a900 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff888126b0a900, ffff888126b0a9c0) The buggy address belongs to the page: page:ffffea00049ac280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x126b0a flags: 0x4000000000000200(slab) raw: 4000000000000200 ffffea00049870c0 0000001100000002 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 889, ts 42409496660, free_ts 42403587611 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:5370 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc_trace+0x1b3/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] mld_add_delrec net/ipv6/mcast.c:734 [inline] igmp6_leave_group net/ipv6/mcast.c:2453 [inline] igmp6_group_dropped+0x445/0xa10 net/ipv6/mcast.c:713 __ipv6_dev_mc_dec+0x22d/0x450 net/ipv6/mcast.c:955 addrconf_leave_solict net/ipv6/addrconf.c:2210 [inline] __ipv6_ifa_notify+0x70e/0xdb0 net/ipv6/addrconf.c:6178 addrconf_ifdown+0xd5c/0x1800 net/ipv6/addrconf.c:3912 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] __dev_notify_flags+0x28f/0x500 net/core/dev.c:-1 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8610 do_setlink+0xbb4/0x3ab0 net/core/rtnetlink.c:2732 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:5429 [inline] __free_pages+0x14b/0x380 mm/page_alloc.c:5440 __vunmap+0x84d/0x9d0 mm/vmalloc.c:2307 free_work+0x5a/0x80 mm/vmalloc.c:69 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 Memory state around the buggy address: ffff888126b0a880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888126b0a900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888126b0a980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888126b0aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888126b0aa80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 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