netlink: 16 bytes leftover after parsing attributes in process `syz.5.1259'. ================================================================== 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+0x842/0x32b0 net/sched/cls_api.c:3640 Read of size 8 at addr ffff8881085c98c0 by task syz.5.1259/4897 CPU: 1 PID: 4897 Comm: syz.5.1259 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 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+0x842/0x32b0 net/sched/cls_api.c:3640 mall_replace_hw_filter+0x2cc/0x8a0 net/sched/cls_matchall.c:100 mall_change+0x546/0x760 net/sched/cls_matchall.c:236 tc_new_tfilter+0x1452/0x1a90 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x845/0xcc0 net/core/rtnetlink.c:5604 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5631 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x89c/0xb50 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x236/0x2e0 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+0x1f9/0x2c0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fba94c82e59 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:00007fba936dd028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fba94efbfa0 RCX: 00007fba94c82e59 RDX: 0000000020000000 RSI: 0000200000000040 RDI: 0000000000000004 RBP: 00007fba94d18d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fba94efc038 R14: 00007fba94efbfa0 R15: 00007ffd26862718 Allocated by task 4897: 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+0x1a4/0x330 mm/slub.c:4038 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [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+0x2e6/0x560 net/sched/act_gact.c:102 tcf_action_init_1+0x443/0x6e0 net/sched/act_api.c:1052 tcf_action_init+0x227/0x780 net/sched/act_api.c:1109 tcf_exts_validate+0x248/0x570 net/sched/cls_api.c:3087 mall_set_parms+0x4b/0x410 net/sched/cls_matchall.c:171 mall_change+0x47a/0x760 net/sched/cls_matchall.c:230 tc_new_tfilter+0x1452/0x1a90 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x845/0xcc0 net/core/rtnetlink.c:5604 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5631 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x89c/0xb50 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x236/0x2e0 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+0x1f9/0x2c0 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+0x11a/0x10b0 kernel/rcu/tree.c:3054 neigh_parms_release+0x1c8/0x200 net/core/neighbour.c:1682 addrconf_ifdown+0x1608/0x1850 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+0x1074/0x1a80 net/core/dev.c:10780 ip_tunnel_delete_nets+0x34b/0x3a0 net/ipv4/ip_tunnel.c:1122 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1713 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x603/0xb80 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13c0 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 __call_rcu kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054 neigh_parms_release+0x1c8/0x200 net/core/neighbour.c:1682 addrconf_ifdown+0x1608/0x1850 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+0x1074/0x1a80 net/core/dev.c:10780 ip6_tnl_exit_batch_net+0x3d5/0x420 net/ipv6/ip6_tunnel.c:2342 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x603/0xb80 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13c0 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 ffff8881085c9800 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff8881085c9800, ffff8881085c98c0) The buggy address belongs to the page: page:ffffea0004217240 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1085c9 flags: 0x4000000000000200(slab) raw: 4000000000000200 0000000000000000 0000000100000001 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 1086876531, free_ts 0 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+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 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] __kmalloc_track_caller+0x1ec/0x320 mm/slub.c:4541 __do_krealloc mm/slab_common.c:1103 [inline] krealloc+0x6a/0x110 mm/slab_common.c:1136 add_sysfs_param+0xce/0x830 kernel/params.c:651 kernel_add_sysfs_param+0xb3/0x128 kernel/params.c:812 param_sysfs_builtin+0x183/0x200 kernel/params.c:851 param_sysfs_init+0x6a/0x6f kernel/params.c:974 do_one_initcall+0x205/0x5e0 init/main.c:1211 do_initcall_level+0x16f/0x2cf init/main.c:1284 do_initcalls+0x50/0x92 init/main.c:1300 do_basic_setup+0x88/0x8f init/main.c:1320 page_owner free stack trace missing Memory state around the buggy address: ffff8881085c9780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881085c9800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881085c9880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8881085c9900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881085c9980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 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