==================================================================
BUG: KASAN: stack-out-of-bounds in string_nocheck lib/vsprintf.c:645 [inline]
BUG: KASAN: stack-out-of-bounds in string+0x394/0x3d0 lib/vsprintf.c:727
Read of size 1 at addr ffffc9000a82f3f5 by task syz-executor.2/14076

CPU: 0 PID: 14076 Comm: syz-executor.2 Not tainted 6.6.0-syzkaller-12401-g8f6f76a6a29f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 string_nocheck lib/vsprintf.c:645 [inline]
 string+0x394/0x3d0 lib/vsprintf.c:727
 vsnprintf+0xc5f/0x1870 lib/vsprintf.c:2818
 vprintk_store+0x3a0/0xb80 kernel/printk/printk.c:2191
 vprintk_emit+0x14c/0x5f0 kernel/printk/printk.c:2288
 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2332
 tcp_inbound_hash.constprop.0+0xdb2/0x10d0 include/net/tcp.h:2760
 tcp_v6_rcv+0x2b31/0x34d0 net/ipv6/tcp_ipv6.c:1882
 ip6_protocol_deliver_rcu+0x33b/0x13d0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip6_input+0xce/0x440 net/ipv6/ip6_input.c:492
 dst_input include/net/dst.h:461 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ipv6_rcv+0x563/0x720 net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5527
 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5641
 netif_receive_skb_internal net/core/dev.c:5727 [inline]
 netif_receive_skb+0x133/0x700 net/core/dev.c:5786
 tun_rx_batched+0x429/0x780 drivers/net/tun.c:1579
 tun_get_user+0x29e3/0x3bc0 drivers/net/tun.c:2002
 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2048
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ff864a7b82f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48
RSP: 002b:00007ff8656ed090 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff864b9bf80 RCX: 00007ff864a7b82f
RDX: 000000000000009e RSI: 0000000020000280 RDI: 00000000000000c8
RBP: 00007ff864ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000009e R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff864b9bf80 R15: 00007ffc5d1df518
 </TASK>

The buggy address belongs to stack of task syz-executor.2/14076
 and is located at offset 101 in frame:
 tcp_inbound_hash.constprop.0+0x0/0x10d0 include/net/net_namespace.h:385

This frame has 3 objects:
 [32, 40) 'md5_tmp'
 [64, 72) 'ao_tmp'
 [96, 101) 'hdr_flags'

The buggy address belongs to the virtual mapping at
 [ffffc9000a828000, ffffc9000a831000) created by:
 kernel_clone+0xfd/0x920 kernel/fork.c:2907

The buggy address belongs to the physical page:
page:ffffea0000e26780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3899e
memcg:ffff8880796b1f02
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff8880796b1f02
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 14074, tgid 14074 (syz-executor.2), ts 3025739448993, free_ts 3024471902533
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0xa25/0x36c0 mm/page_alloc.c:3312
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4568
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 vm_area_alloc_pages mm/vmalloc.c:3063 [inline]
 __vmalloc_area_node mm/vmalloc.c:3139 [inline]
 __vmalloc_node_range+0x8f3/0x1bf0 mm/vmalloc.c:3320
 alloc_thread_stack_node kernel/fork.c:309 [inline]
 dup_task_struct kernel/fork.c:1118 [inline]
 copy_process+0x13e3/0x74b0 kernel/fork.c:2332
 kernel_clone+0xfd/0x920 kernel/fork.c:2907
 __do_sys_clone3+0x1f1/0x260 kernel/fork.c:3208
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x4f8/0xa90 mm/page_alloc.c:2347
 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487
 __folio_put_small mm/swap.c:106 [inline]
 __folio_put+0xc3/0x110 mm/swap.c:129
 folio_put include/linux/mm.h:1483 [inline]
 put_page include/linux/mm.h:1552 [inline]
 aio_free_ring+0x5d6/0x820 fs/aio.c:345
 free_ioctx+0x21/0xa0 fs/aio.c:618
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffffc9000a82f280: 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 00 00 00
 ffffc9000a82f300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000a82f380: 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 05 f3
                                                             ^
 ffffc9000a82f400: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000a82f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
TCP segment has incorrect auth options set for [fe80::bb]:0->[fe80::aa]:20002 FSRA 
==================================================================
BUG: KASAN: stack-out-of-bounds in string_nocheck lib/vsprintf.c:645 [inline]
BUG: KASAN: stack-out-of-bounds in string+0x394/0x3d0 lib/vsprintf.c:727
Read of size 1 at addr ffffc9000a82f3f5 by task syz-executor.2/14076

CPU: 0 PID: 14076 Comm: syz-executor.2 Tainted: G    B              6.6.0-syzkaller-12401-g8f6f76a6a29f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 string_nocheck lib/vsprintf.c:645 [inline]
 string+0x394/0x3d0 lib/vsprintf.c:727
 vsnprintf+0xc5f/0x1870 lib/vsprintf.c:2818
 vscnprintf+0x40/0x80 lib/vsprintf.c:2924
 printk_sprint+0x31/0x2f0 kernel/printk/printk.c:2128
 vprintk_store+0x4d8/0xb80 kernel/printk/printk.c:2242
 vprintk_emit+0x14c/0x5f0 kernel/printk/printk.c:2288
 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2332
 tcp_inbound_hash.constprop.0+0xdb2/0x10d0 include/net/tcp.h:2760
 tcp_v6_rcv+0x2b31/0x34d0 net/ipv6/tcp_ipv6.c:1882
 ip6_protocol_deliver_rcu+0x33b/0x13d0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip6_input+0xce/0x440 net/ipv6/ip6_input.c:492
 dst_input include/net/dst.h:461 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ipv6_rcv+0x563/0x720 net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5527
 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5641
 netif_receive_skb_internal net/core/dev.c:5727 [inline]
 netif_receive_skb+0x133/0x700 net/core/dev.c:5786
 tun_rx_batched+0x429/0x780 drivers/net/tun.c:1579
 tun_get_user+0x29e3/0x3bc0 drivers/net/tun.c:2002
 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2048
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ff864a7b82f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48
RSP: 002b:00007ff8656ed090 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff864b9bf80 RCX: 00007ff864a7b82f
RDX: 000000000000009e RSI: 0000000020000280 RDI: 00000000000000c8
RBP: 00007ff864ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000009e R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff864b9bf80 R15: 00007ffc5d1df518
 </TASK>

The buggy address belongs to stack of task syz-executor.2/14076
 and is located at offset 101 in frame:
 tcp_inbound_hash.constprop.0+0x0/0x10d0 include/net/net_namespace.h:385

This frame has 3 objects:
 [32, 40) 'md5_tmp'
 [64, 72) 'ao_tmp'
 [96, 101) 'hdr_flags'

The buggy address belongs to the virtual mapping at
 [ffffc9000a828000, ffffc9000a831000) created by:
 kernel_clone+0xfd/0x920 kernel/fork.c:2907

The buggy address belongs to the physical page:
page:ffffea0000e26780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3899e
memcg:ffff8880796b1f02
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff8880796b1f02
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 14074, tgid 14074 (syz-executor.2), ts 3025739448993, free_ts 3024471902533
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0xa25/0x36c0 mm/page_alloc.c:3312
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4568
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 vm_area_alloc_pages mm/vmalloc.c:3063 [inline]
 __vmalloc_area_node mm/vmalloc.c:3139 [inline]
 __vmalloc_node_range+0x8f3/0x1bf0 mm/vmalloc.c:3320
 alloc_thread_stack_node kernel/fork.c:309 [inline]
 dup_task_struct kernel/fork.c:1118 [inline]
 copy_process+0x13e3/0x74b0 kernel/fork.c:2332
 kernel_clone+0xfd/0x920 kernel/fork.c:2907
 __do_sys_clone3+0x1f1/0x260 kernel/fork.c:3208
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x4f8/0xa90 mm/page_alloc.c:2347
 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487
 __folio_put_small mm/swap.c:106 [inline]
 __folio_put+0xc3/0x110 mm/swap.c:129
 folio_put include/linux/mm.h:1483 [inline]
 put_page include/linux/mm.h:1552 [inline]
 aio_free_ring+0x5d6/0x820 fs/aio.c:345
 free_ioctx+0x21/0xa0 fs/aio.c:618
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffffc9000a82f280: 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 00 00 00
 ffffc9000a82f300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000a82f380: 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 05 f3
                                                             ^
 ffffc9000a82f400: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000a82f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================