device veth1_macvtap left promiscuous mode
device veth0_macvtap left promiscuous mode
device veth1_vlan left promiscuous mode
device veth0_vlan left promiscuous mode
==================================================================
BUG: KASAN: slab-out-of-bounds in qfq_reset_qdisc+0x292/0x300 net/sched/sch_qfq.c:1468
Read of size 4 at addr ffff8880a831bbe0 by task kworker/u4:0/26854

CPU: 0 PID: 26854 Comm: kworker/u4:0 Not tainted 4.19.112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 print_address_description.cold+0x7c/0x212 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396
 qfq_reset_qdisc+0x292/0x300 net/sched/sch_qfq.c:1468
 qdisc_destroy+0x144/0x6b0 net/sched/sch_generic.c:980
 dev_shutdown+0x2b5/0x47a net/sched/sch_generic.c:1300
 rollback_registered_many+0x64a/0xc40 net/core/dev.c:8173
 unregister_netdevice_many.part.0+0x16/0x1e0 net/core/dev.c:9294
 unregister_netdevice_many net/core/dev.c:9293 [inline]
 default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:9765
 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:156
 cleanup_net+0x3bf/0x850 net/core/net_namespace.c:553
 process_one_work+0x91f/0x1640 kernel/workqueue.c:2155
 worker_thread+0x96/0xe20 kernel/workqueue.c:2298
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 4379:
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531
 kmem_cache_alloc_trace+0x14d/0x7a0 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 kobject_create+0x38/0x70 lib/kobject.c:739
 kobject_create_and_add+0x16/0x60 lib/kobject.c:765
 batadv_sysfs_add_hardif+0x30/0x120 net/batman-adv/sysfs.c:1168
 batadv_hardif_add_interface net/batman-adv/hard-interface.c:921 [inline]
 batadv_hard_if_event+0xd70/0x14f0 net/batman-adv/hard-interface.c:1038
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1766 [inline]
 register_netdevice+0x9b0/0xf50 net/core/dev.c:8738
 veth_newlink+0x400/0x950 drivers/net/veth.c:1143
 rtnl_newlink+0xf03/0x1440 net/core/rtnetlink.c:3141
 rtnetlink_rcv_msg+0x453/0xaf0 net/core/rtnetlink.c:4777
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8094:
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xce/0x220 mm/slab.c:3822
 __vunmap+0x2d0/0x3e0 mm/vmalloc.c:1536
 vfree+0x65/0x100 mm/vmalloc.c:1597
 __do_replace+0x169/0x8a0 net/ipv6/netfilter/ip6_tables.c:1120
 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline]
 do_ip6t_set_ctl+0x2d2/0x425 net/ipv6/netfilter/ip6_tables.c:1684
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x6f/0xc0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt net/ipv6/ipv6_sockglue.c:944 [inline]
 ipv6_setsockopt+0x13c/0x170 net/ipv6/ipv6_sockglue.c:928
 tcp_setsockopt net/ipv4/tcp.c:3082 [inline]
 tcp_setsockopt+0x86/0xd0 net/ipv4/tcp.c:3076
 __sys_setsockopt+0x14d/0x240 net/socket.c:1901
 __do_sys_setsockopt net/socket.c:1912 [inline]
 __se_sys_setsockopt net/socket.c:1909 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:1909
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a831bb80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 32 bytes to the right of
 64-byte region [ffff8880a831bb80, ffff8880a831bbc0)
The buggy address belongs to the page:
page:ffffea0002a0c6c0 count:1 mapcount:0 mapping:ffff88812c3dc340 index:0xffff8880a831ba80
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00022f3348 ffffea00012f9308 ffff88812c3dc340
raw: ffff8880a831ba80 ffff8880a831b000 0000000100000019 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a831ba80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a831bb00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
>ffff8880a831bb80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                                       ^
 ffff8880a831bc00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff8880a831bc80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================