syzbot

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BUG: KASAN: use-after-free in __tcf_qdisc_find+0x711/0x770 net/sched/cls_api.c:1049
Read of size 4 at addr ffff888151dc6438 by task syz-executor.2/3828

CPU: 1 PID: 3828 Comm: syz-executor.2 Tainted: G        W         5.10.134-syzkaller-01772-gf6ce9a9115d5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3c0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 __tcf_qdisc_find+0x711/0x770 net/sched/cls_api.c:1049
 tc_new_tfilter+0x412/0x1c40 net/sched/cls_api.c:2005
 rtnetlink_rcv_msg+0x76e/0xc60 net/core/rtnetlink.c:5562
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2515
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5589
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x91a/0xb10 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0xa40/0xd00 net/netlink/af_netlink.c:1934
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x597/0x8e0 net/socket.c:2343
 ___sys_sendmsg net/socket.c:2397 [inline]
 __sys_sendmsg+0x37b/0x460 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2437
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f270c9b0279
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f270bb26168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f270cac2f80 RCX: 00007f270c9b0279
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000004
RBP: 00007f270ca0a189 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc484f14ef R14: 00007f270bb26300 R15: 0000000000022000

Allocated by task 3833:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:428 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516
 kasan_kmalloc include/linux/kasan.h:269 [inline]
 __kmalloc+0x1f7/0x360 mm/slub.c:4042
 __kmalloc_node include/linux/slab.h:418 [inline]
 kmalloc_node include/linux/slab.h:575 [inline]
 kzalloc_node include/linux/slab.h:675 [inline]
 qdisc_alloc+0x75/0x750 net/sched/sch_generic.c:861
 qdisc_create_dflt+0x6b/0x3b0 net/sched/sch_generic.c:924
 attach_one_default_qdisc net/sched/sch_generic.c:1072 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2306 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1090 [inline]
 dev_activate+0x2da/0x10f0 net/sched/sch_generic.c:1148
 __dev_open+0x3bd/0x4e0 net/core/dev.c:1551
 __dev_change_flags+0x1e0/0x6d0 net/core/dev.c:8496
 rtnl_configure_link net/core/rtnetlink.c:3126 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3454 [inline]
 rtnl_newlink+0x1896/0x1ff0 net/core/rtnetlink.c:3494
 rtnetlink_rcv_msg+0x95a/0xc60 net/core/rtnetlink.c:5571
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2515
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5589
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x91a/0xb10 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0xa40/0xd00 net/netlink/af_netlink.c:1934
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x597/0x8e0 net/socket.c:2343
 ___sys_sendmsg net/socket.c:2397 [inline]
 __sys_sendmsg+0x37b/0x460 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2437
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Freed by task 383:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:360
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:1604 [inline]
 slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630
 slab_free mm/slub.c:3212 [inline]
 kfree+0xc3/0x290 mm/slub.c:4200
 qdisc_free net/sched/sch_generic.c:975 [inline]
 qdisc_free_cb+0xae/0xe0 net/sched/sch_generic.c:982
 rcu_do_batch+0x59e/0xc40 kernel/rcu/tree.c:2485
 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2726
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2739
 __do_softirq+0x27e/0x596 kernel/softirq.c:305

Last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:2967 [inline]
 call_rcu+0x140/0x1300 kernel/rcu/tree.c:3041
 qdisc_destroy+0x14e/0x230 net/sched/sch_generic.c:1006
 qdisc_put+0x83/0xf0 net/sched/sch_generic.c:1018
 notify_and_destroy net/sched/sch_api.c:1012 [inline]
 qdisc_graft+0xcdb/0x1230 net/sched/sch_api.c:1084
 tc_modify_qdisc+0xce0/0x13b0 net/sched/sch_api.c:1680
 rtnetlink_rcv_msg+0x95a/0xc60 net/core/rtnetlink.c:5571
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2515
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5589
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x91a/0xb10 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0xa40/0xd00 net/netlink/af_netlink.c:1934
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x597/0x8e0 net/socket.c:2343
 ___sys_sendmsg net/socket.c:2397 [inline]
 __sys_sendmsg+0x37b/0x460 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2437
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Second to last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:2967 [inline]
 call_rcu+0x140/0x1300 kernel/rcu/tree.c:3041
 inetdev_destroy net/ipv4/devinet.c:328 [inline]
 inetdev_event+0x83e/0x1090 net/ipv4/devinet.c:1599
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x9e/0x110 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+0xeae/0x18c0 net/core/dev.c:10730
 ip_tunnel_delete_nets+0x375/0x3c0 net/ipv4/ip_tunnel.c:1122
 ipgre_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1026
 ops_exit_list net/core/net_namespace.c:192 [inline]
 cleanup_net+0x77c/0xd70 net/core/net_namespace.c:608
 process_one_work+0x726/0xc10 kernel/workqueue.c:2296
 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442
 kthread+0x349/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299

The buggy address belongs to the object at ffff888151dc6400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 56 bytes inside of
 512-byte region [ffff888151dc6400, ffff888151dc6600)
The buggy address belongs to the page:
page:ffffea0005477100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x151dc4
head:ffffea0005477100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff888100043080
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 381, ts 97744127920, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2385 [inline]
 prep_new_page mm/page_alloc.c:2391 [inline]
 get_page_from_freelist+0x745/0x760 mm/page_alloc.c:4067
 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5117
 alloc_slab_page mm/slub.c:1815 [inline]
 allocate_slab+0x78/0x540 mm/slub.c:1817
 new_slab mm/slub.c:1878 [inline]
 new_slab_objects mm/slub.c:2636 [inline]
 ___slab_alloc+0x131/0x2e0 mm/slub.c:2800
 __slab_alloc+0x63/0xa0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc_trace+0x20e/0x330 mm/slub.c:2981
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 ipv6_add_addr+0x41e/0xd60 net/ipv6/addrconf.c:1096
 addrconf_add_linklocal+0x31f/0x9b0 net/ipv6/addrconf.c:3226
 addrconf_addr_gen+0x55a/0xcc0 net/ipv6/addrconf.c:3357
 addrconf_dev_config+0x32e/0x570 net/ipv6/addrconf.c:3409
 addrconf_notify+0x8d9/0xe90 net/ipv6/addrconf.c:3642
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:410
 __dev_notify_flags+0x2ef/0x5f0 net/core/dev.c:2054
 dev_change_flags+0xec/0x190 net/core/dev.c:8572
 do_setlink+0xc3e/0x3b50 net/core/rtnetlink.c:2709
 __rtnl_newlink net/core/rtnetlink.c:3379 [inline]
 rtnl_newlink+0x166a/0x1ff0 net/core/rtnetlink.c:3494
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888151dc6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888151dc6380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888151dc6400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff888151dc6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888151dc6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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