==================================================================
BUG: KASAN: slab-out-of-bounds in decode_session6 net/xfrm/xfrm_policy.c:3376 [inline]
BUG: KASAN: slab-out-of-bounds in __xfrm_decode_session+0x19de/0x23e0 net/xfrm/xfrm_policy.c:3483
Read of size 1 at addr ffff88806dbf6fae by task kworker/u4:14/4453

CPU: 1 PID: 4453 Comm: kworker/u4:14 Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 decode_session6 net/xfrm/xfrm_policy.c:3376 [inline]
 __xfrm_decode_session+0x19de/0x23e0 net/xfrm/xfrm_policy.c:3483
 vti6_tnl_xmit+0x439/0x1ae0
 __netdev_start_xmit include/linux/netdevice.h:5019 [inline]
 netdev_start_xmit include/linux/netdevice.h:5033 [inline]
 xmit_one net/core/dev.c:3592 [inline]
 dev_hard_start_xmit+0x298/0x7a0 net/core/dev.c:3608
 sch_direct_xmit+0x2b2/0x5e0 net/sched/sch_generic.c:342
 qdisc_restart net/sched/sch_generic.c:407 [inline]
 __qdisc_run+0xae2/0x1e90 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3877 [inline]
 __dev_queue_xmit+0xf0a/0x3230 net/core/dev.c:4188
 neigh_output include/net/neighbour.h:516 [inline]
 ip6_finish_output2+0xee4/0x14f0 net/ipv6/ip6_output.c:126
 dst_output include/net/dst.h:449 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ndisc_send_skb+0xae0/0x13c0 net/ipv6/ndisc.c:508
 addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3932
 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1737
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x155/0x240 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:is_idle_task include/linux/sched.h:1872 [inline]
RIP: 0010:___might_sleep+0x1e4/0x6a0 kernel/sched/core.c:9594
Code: 89 e7 48 89 d3 e8 dc 64 70 00 48 89 da f6 84 24 a1 00 00 00 02 45 89 ec 74 46 4c 8d 62 2c 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 ec 03 00 00 41 f6 04 24 02 45 89 ec 75 24 48 8d 9a b0
RSP: 0018:ffffc900036df940 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 1ffff920006dbf3c RCX: ffff8880300c8000
RDX: ffff8880300c8000 RSI: ffffffff8a8b0e00 RDI: ffffffff8ad858c0
RBP: ffffc900036dfa50 R08: dffffc0000000000 R09: fffffbfff1bc744e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880300c802c
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006dbf30
 inet_twsk_purge+0x10f/0xa20 net/ipv4/inet_timewait_sock.c:267
 ops_exit_list net/core/net_namespace.c:174 [inline]
 cleanup_net+0x763/0xb60 net/core/net_namespace.c:596
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>

Allocated by task 5853:
 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:434 [inline]
 ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc_node_track_caller+0x195/0x390 mm/slub.c:4963
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 __alloc_skb+0x12c/0x590 net/core/skbuff.c:427
 alloc_skb include/linux/skbuff.h:1167 [inline]
 ndisc_alloc_skb+0xee/0x2c0 net/ipv6/ndisc.c:420
 ndisc_send_rs+0x269/0x6a0 net/ipv6/ndisc.c:686
 addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3932
 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1737
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558

Freed by task 5853:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kfree+0xf1/0x270 mm/slub.c:4559
 skb_free_head net/core/skbuff.c:655 [inline]
 skb_release_data+0x73a/0x8a0 net/core/skbuff.c:677
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb net/core/skbuff.c:756 [inline]
 kfree_skb_reason+0xb3/0x170 net/core/skbuff.c:776
 kfree_skb include/linux/skbuff.h:1123 [inline]
 xfrmi_xmit+0xac4/0x1590 net/xfrm/xfrm_interface.c:447
 __netdev_start_xmit include/linux/netdevice.h:5019 [inline]
 netdev_start_xmit include/linux/netdevice.h:5033 [inline]
 xmit_one net/core/dev.c:3592 [inline]
 dev_hard_start_xmit+0x298/0x7a0 net/core/dev.c:3608
 __dev_queue_xmit+0x1cee/0x3230 net/core/dev.c:4223
 neigh_output include/net/neighbour.h:516 [inline]
 ip6_finish_output2+0xee4/0x14f0 net/ipv6/ip6_output.c:126
 dst_output include/net/dst.h:449 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ndisc_send_skb+0xae0/0x13c0 net/ipv6/ndisc.c:508
 addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3932
 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1737
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558

The buggy address belongs to the object at ffff88806dbf6c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 430 bytes to the right of
 512-byte region [ffff88806dbf6c00, ffff88806dbf6e00)
The buggy address belongs to the page:
page:ffffea0001b6fd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6dbf4
head:ffffea0001b6fd00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011c41c80
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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 14, ts 60823936311, free_ts 13308416334
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421
 alloc_slab_page mm/slub.c:1775 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xbb/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 __kmalloc_node_track_caller+0x1f6/0x390 mm/slub.c:4958
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 __alloc_skb+0x12c/0x590 net/core/skbuff.c:427
 __napi_alloc_skb+0x15c/0x2d0 net/core/skbuff.c:568
 napi_alloc_skb include/linux/skbuff.h:3046 [inline]
 page_to_skb+0x294/0xd20 drivers/net/virtio_net.c:454
 receive_mergeable drivers/net/virtio_net.c:1070 [inline]
 receive_buf+0x1218/0x6490 drivers/net/virtio_net.c:1180
 virtnet_receive drivers/net/virtio_net.c:1472 [inline]
 virtnet_poll+0x629/0x1270 drivers/net/virtio_net.c:1585
 __napi_poll+0xc7/0x440 net/core/dev.c:7008
 napi_poll net/core/dev.c:7075 [inline]
 net_rx_action+0x617/0xda0 net/core/dev.c:7162
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558
 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:920
 smpboot_thread_fn+0x51b/0x9d0 kernel/smpboot.c:164
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
 free_contig_range+0x95/0xf0 mm/page_alloc.c:9340
 destroy_args+0xfe/0x97f mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x40d/0x462 mm/debug_vm_pgtable.c:1331
 do_one_initcall+0x22b/0x7a0 init/main.c:1306
 do_initcall_level+0x157/0x207 init/main.c:1379
 do_initcalls+0x49/0x86 init/main.c:1395
 kernel_init_freeable+0x43c/0x5c5 init/main.c:1619
 kernel_init+0x19/0x290 init/main.c:1510
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff88806dbf6e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806dbf6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806dbf6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88806dbf7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806dbf7080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	89 e7                	mov    %esp,%edi
   2:	48 89 d3             	mov    %rdx,%rbx
   5:	e8 dc 64 70 00       	callq  0x7064e6
   a:	48 89 da             	mov    %rbx,%rdx
   d:	f6 84 24 a1 00 00 00 	testb  $0x2,0xa1(%rsp)
  14:	02
  15:	45 89 ec             	mov    %r13d,%r12d
  18:	74 46                	je     0x60
  1a:	4c 8d 62 2c          	lea    0x2c(%rdx),%r12
  1e:	4c 89 e0             	mov    %r12,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	0f 85 ec 03 00 00    	jne    0x41e
  32:	41 f6 04 24 02       	testb  $0x2,(%r12)
  37:	45 89 ec             	mov    %r13d,%r12d
  3a:	75 24                	jne    0x60
  3c:	48                   	rex.W
  3d:	8d                   	.byte 0x8d
  3e:	9a                   	(bad)
  3f:	b0                   	.byte 0xb0