==================================================================
BUG: KASAN: use-after-free in nf_hook_entries_get_hook_ops include/linux/netfilter.h:130 [inline]
BUG: KASAN: use-after-free in hooks_validate+0x173/0x1b0 net/netfilter/core.c:171
Read of size 2 at addr ffff888013fe6000 by task syz-executor.4/19402

CPU: 1 PID: 19402 Comm: syz-executor.4 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 nf_hook_entries_get_hook_ops include/linux/netfilter.h:130 [inline]
 hooks_validate+0x173/0x1b0 net/netfilter/core.c:171
 __nf_register_net_hook+0x17f/0x620 net/netfilter/core.c:416
 nf_register_net_hook+0x114/0x170 net/netfilter/core.c:541
 nf_register_net_hooks+0x59/0xc0 net/netfilter/core.c:557
 nf_synproxy_ipv6_init+0x85/0xe0 net/netfilter/nf_synproxy_core.c:1219
 synproxy_tg6_check+0x30d/0x560 net/ipv6/netfilter/ip6t_SYNPROXY.c:81
 xt_check_target+0x26c/0x9e0 net/netfilter/x_tables.c:1024
 check_target net/ipv6/netfilter/ip6_tables.c:529 [inline]
 find_check_entry.constprop.0+0x7f1/0x9e0 net/ipv6/netfilter/ip6_tables.c:572
 translate_table+0xc8b/0x1750 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline]
 do_ip6t_set_ctl+0x56e/0xb90 net/ipv6/netfilter/ip6_tables.c:1638
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 udpv6_setsockopt+0x76/0xc0 net/ipv6/udp.c:1646
 __sys_setsockopt+0x2db/0x610 net/socket.c:2159
 __do_sys_setsockopt net/socket.c:2170 [inline]
 __se_sys_setsockopt net/socket.c:2167 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff127f88188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000005
RBP: 00000000004bfcc4 R08: 00000000000004c0 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 0000000000a9fb1f R14: 00007ff127f88300 R15: 0000000000022000

Allocated by task 19402:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522
 kmalloc_node include/linux/slab.h:614 [inline]
 kvmalloc_node+0x61/0xf0 mm/util.c:587
 kvmalloc include/linux/mm.h:806 [inline]
 kvzalloc include/linux/mm.h:814 [inline]
 allocate_hook_entries_size net/netfilter/core.c:61 [inline]
 nf_hook_entries_grow+0x140/0x780 net/netfilter/core.c:128
 __nf_register_net_hook+0x128/0x620 net/netfilter/core.c:407
 nf_register_net_hook+0x114/0x170 net/netfilter/core.c:541
 nf_register_net_hooks+0x59/0xc0 net/netfilter/core.c:557
 nf_synproxy_ipv6_init+0x85/0xe0 net/netfilter/nf_synproxy_core.c:1219
 synproxy_tg6_check+0x30d/0x560 net/ipv6/netfilter/ip6t_SYNPROXY.c:81
 xt_check_target+0x26c/0x9e0 net/netfilter/x_tables.c:1024
 check_target net/ipv6/netfilter/ip6_tables.c:529 [inline]
 find_check_entry.constprop.0+0x7f1/0x9e0 net/ipv6/netfilter/ip6_tables.c:572
 translate_table+0xc8b/0x1750 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline]
 do_ip6t_set_ctl+0x56e/0xb90 net/ipv6/netfilter/ip6_tables.c:1638
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 udpv6_setsockopt+0x76/0xc0 net/ipv6/udp.c:1646
 __sys_setsockopt+0x2db/0x610 net/socket.c:2159
 __do_sys_setsockopt net/socket.c:2170 [inline]
 __se_sys_setsockopt net/socket.c:2167 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 19406:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1628 [inline]
 slab_free_freelist_hook+0xe3/0x250 mm/slub.c:1653
 slab_free mm/slub.c:3213 [inline]
 kfree+0xe4/0x540 mm/slub.c:4267
 kvfree+0x42/0x50 mm/util.c:616
 rcu_do_batch kernel/rcu/tree.c:2550 [inline]
 rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3029 [inline]
 call_rcu+0xb1/0x750 kernel/rcu/tree.c:3109
 nf_hook_entries_free net/netfilter/core.c:88 [inline]
 nf_hook_entries_free net/netfilter/core.c:75 [inline]
 __nf_register_net_hook+0x29d/0x620 net/netfilter/core.c:424
 nf_register_net_hook+0x114/0x170 net/netfilter/core.c:541
 nf_register_net_hooks+0x59/0xc0 net/netfilter/core.c:557
 nf_synproxy_ipv6_init+0x85/0xe0 net/netfilter/nf_synproxy_core.c:1219
 synproxy_tg6_check+0x30d/0x560 net/ipv6/netfilter/ip6t_SYNPROXY.c:81
 xt_check_target+0x26c/0x9e0 net/netfilter/x_tables.c:1024
 check_target net/ipv6/netfilter/ip6_tables.c:529 [inline]
 find_check_entry.constprop.0+0x7f1/0x9e0 net/ipv6/netfilter/ip6_tables.c:572
 translate_table+0xc8b/0x1750 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline]
 do_ip6t_set_ctl+0x56e/0xb90 net/ipv6/netfilter/ip6_tables.c:1638
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 udpv6_setsockopt+0x76/0xc0 net/ipv6/udp.c:1646
 __sys_setsockopt+0x2db/0x610 net/socket.c:2159
 __do_sys_setsockopt net/socket.c:2170 [inline]
 __se_sys_setsockopt net/socket.c:2167 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 insert_work+0x48/0x370 kernel/workqueue.c:1332
 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498
 queue_work_on+0xee/0x110 kernel/workqueue.c:1525
 queue_work include/linux/workqueue.h:507 [inline]
 call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435
 kobject_uevent_env+0xf8f/0x1650 lib/kobject_uevent.c:618
 kvm_uevent_notify_change.part.0+0x303/0x440 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5230
 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:5189 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1097 [inline]
 kvm_put_kvm+0xf6/0xd80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1140
 kvm_vm_release+0x3f/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1163
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888013fe6000
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes inside of
 192-byte region [ffff888013fe6000, ffff888013fe60c0)
The buggy address belongs to the page:
page:ffffea00004ff980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13fe6
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00005f4dc0 0000000700000007 ffff888010841a00
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 7, ts 9527556451, free_ts 8506516985
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4168
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5390
 __alloc_pages_node include/linux/gfp.h:570 [inline]
 alloc_slab_page mm/slub.c:1693 [inline]
 allocate_slab+0x96/0x4b0 mm/slub.c:1831
 new_slab mm/slub.c:1894 [inline]
 new_slab_objects mm/slub.c:2640 [inline]
 ___slab_alloc+0x4ba/0x820 mm/slub.c:2803
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843
 slab_alloc_node mm/slub.c:2925 [inline]
 kmem_cache_alloc_node_trace+0x18f/0x410 mm/slub.c:3009
 kmalloc_node include/linux/slab.h:609 [inline]
 kzalloc_node include/linux/slab.h:732 [inline]
 alloc_worker+0x43/0x1c0 kernel/workqueue.c:1827
 create_worker+0xce/0x530 kernel/workqueue.c:1924
 maybe_create_worker kernel/workqueue.c:2095 [inline]
 manage_workers kernel/workqueue.c:2147 [inline]
 worker_thread+0xb2a/0x11f0 kernel/workqueue.c:2394
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1346 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397
 free_unref_page_prepare mm/page_alloc.c:3332 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3411
 mm_free_pgd kernel/fork.c:636 [inline]
 __mmdrop+0xcb/0x3f0 kernel/fork.c:687
 mmdrop include/linux/sched/mm.h:49 [inline]
 __mmput+0x3b4/0x470 kernel/fork.c:1111
 mmput+0x58/0x60 kernel/fork.c:1122
 free_bprm+0x65/0x2e0 fs/exec.c:1479
 kernel_execve+0x380/0x460 fs/exec.c:1976
 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff888013fe5f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
 ffff888013fe5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888013fe6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888013fe6080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888013fe6100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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