================================================================== 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+0xbb8/0x3630 net/sched/cls_api.c:3639 Read of size 8 at addr ffff88810bfb79c0 by task syz.4.5701/20574 CPU: 0 PID: 20574 Comm: syz.4.5701 Tainted: G W 5.10.232-syzkaller-00746-g49e8ba0a684f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 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+0xbb8/0x3630 net/sched/cls_api.c:3639 mall_replace_hw_filter+0x394/0xc10 net/sched/cls_matchall.c:100 mall_change+0x573/0x7a0 net/sched/cls_matchall.c:236 tc_new_tfilter+0x168e/0x1dc0 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x77a/0xc50 net/core/rtnetlink.c:5598 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1c1505bd29 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:00007f1c136cd038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1c1524bfa0 RCX: 00007f1c1505bd29 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000003 RBP: 00007f1c150d7b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1c1524bfa0 R15: 00007ffe7327f678 Allocated by task 20574: 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+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1aa/0x330 mm/slub.c:4033 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] tcf_idr_create+0x5f/0x770 net/sched/act_api.c:430 tcf_idr_create_from_flags+0x5f/0x70 net/sched/act_api.c:488 tcf_gact_init+0x373/0x6e0 net/sched/act_gact.c:102 tcf_action_init_1+0x584/0x830 net/sched/act_api.c:1052 tcf_action_init+0x2b5/0x800 net/sched/act_api.c:1109 tcf_exts_validate+0x232/0x540 net/sched/cls_api.c:3086 mall_set_parms+0x4b/0x440 net/sched/cls_matchall.c:171 mall_change+0x49e/0x7a0 net/sched/cls_matchall.c:230 tc_new_tfilter+0x168e/0x1dc0 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x77a/0xc50 net/core/rtnetlink.c:5598 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x634/0x7c0 net/netfilter/core.c:419 nf_register_net_hook+0xb6/0x190 net/netfilter/core.c:536 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:552 nf_ct_netns_do_get+0x193/0x460 net/netfilter/nf_conntrack_proto.c:484 nf_ct_netns_get+0x82/0xb0 net/netfilter/nf_conntrack_proto.c:603 connmark_tg_check+0x58/0x100 net/netfilter/xt_connmark.c:108 xt_check_target+0x3b0/0xa40 net/netfilter/x_tables.c:1018 check_target net/ipv6/netfilter/ip6_tables.c:530 [inline] find_check_entry net/ipv6/netfilter/ip6_tables.c:573 [inline] translate_table+0x1a69/0x2320 net/ipv6/netfilter/ip6_tables.c:735 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0xdcf/0x1220 net/ipv6/netfilter/ip6_tables.c:1646 nf_setsockopt+0x274/0x2a0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x2789/0x3ea0 net/ipv6/ipv6_sockglue.c:1014 rawv6_setsockopt+0x323/0x750 net/ipv6/raw.c:1089 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3318 __sys_setsockopt+0x502/0x870 net/socket.c:2146 __do_sys_setsockopt net/socket.c:2157 [inline] __se_sys_setsockopt net/socket.c:2154 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2154 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88810bfb7900 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff88810bfb7900, ffff88810bfb79c0) The buggy address belongs to the page: page:ffffea00042fedc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10bfb7 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 2483517457, 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+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc_trace+0x1bd/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] mca_alloc net/ipv6/mcast.c:853 [inline] __ipv6_dev_mc_inc+0x3d0/0x980 net/ipv6/mcast.c:911 ipv6_dev_mc_inc+0x1f/0x30 net/ipv6/mcast.c:935 ipv6_add_dev+0xcfb/0x10b0 net/ipv6/addrconf.c:461 addrconf_notify+0x58e/0xe90 net/ipv6/addrconf.c:3567 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 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+0x145/0x1b0 net/core/dev.c:2080 register_netdevice+0x1066/0x13f0 net/core/dev.c:10086 register_netdev+0x3c/0x50 net/core/dev.c:10179 ip6gre_init_net+0x253/0x320 net/ipv6/ip6_gre.c:1627 page_owner free stack trace missing Memory state around the buggy address: ffff88810bfb7880: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff88810bfb7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810bfb7980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88810bfb7a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810bfb7a80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================