================================================================== 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 ffff88811dd13fc0 by task syz.8.1126/3999 CPU: 0 PID: 3999 Comm: syz.8.1126 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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 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:5601 netlink_rcv_skb+0x1f5/0x440 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+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: 0033:0x7f8317875629 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:00007f83162d0028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8317aeefa0 RCX: 00007f8317875629 RDX: 0000000020000000 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f831790bb39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8317aef038 R14: 00007f8317aeefa0 R15: 00007fff387cfb58 Allocated by task 3999: 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:3086 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:5601 netlink_rcv_skb+0x1f5/0x440 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+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 inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0x82e/0x1040 net/ipv4/devinet.c:1612 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:10767 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 The buggy address belongs to the object at ffff88811dd13f00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff88811dd13f00, ffff88811dd13fc0) The buggy address belongs to the page: page:ffffea00047744c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11dd13 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 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 267, ts 19552349524, free_ts 19551932701 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: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+0x1b0/0x2e0 mm/slub.c:2977 cgroup_setup_root+0x1b3/0x910 kernel/cgroup/cgroup.c:2040 cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1224 [inline] cgroup1_get_tree+0x7ee/0xc70 kernel/cgroup/cgroup-v1.c:1241 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:3006 path_mount+0x585/0xc90 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 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+0x146/0x3b0 mm/page_alloc.c:5440 free_pages+0x82/0x90 mm/page_alloc.c:5451 selinux_genfs_get_sid+0x20b/0x250 security/selinux/hooks.c:1332 inode_doinit_with_dentry+0x879/0xd70 security/selinux/hooks.c:1529 sb_finish_set_opts+0x528/0x7d0 security/selinux/hooks.c:538 selinux_set_mnt_opts+0x1453/0x1a90 security/selinux/hooks.c:831 security_sb_set_mnt_opts+0x71/0xd0 security/security.c:915 vfs_get_tree+0x14e/0x260 fs/super.c:1597 do_new_mount+0x25a/0xa20 fs/namespace.c:3006 path_mount+0x585/0xc90 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88811dd13e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88811dd13f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811dd13f80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88811dd14000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811dd14080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== device syzkaller0 entered promiscuous mode 0: reclassify loop, rule prio 0, protocol 800