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BUG: KASAN: slab-out-of-bounds in decode_session6+0xfc3/0x17f0 net/xfrm/xfrm_policy.c:3376
Read of size 1 at addr ffff888025de3ffb by task ksoftirqd/0/15

CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.0.0-rc1-syzkaller-00261-g917edfb98c48 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 decode_session6+0xfc3/0x17f0 net/xfrm/xfrm_policy.c:3376
 __xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3482
 xfrm_decode_session include/net/xfrm.h:1160 [inline]
 vti6_tnl_xmit+0x419/0x1f90 net/ipv6/ip6_vti.c:577
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
 sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342
 qdisc_restart net/sched/sch_generic.c:407 [inline]
 __qdisc_run+0x4bb/0x1710 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3880 [inline]
 __dev_queue_xmit+0x2299/0x3ad0 net/core/dev.c:4222
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1575
 neigh_output include/net/neighbour.h:551 [inline]
 ip6_finish_output2+0x564/0x1520 net/ipv6/ip6_output.c:134
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0x690/0x1160 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x1ed/0x540 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:451 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ndisc_send_skb+0xa5f/0x1730 net/ipv6/ndisc.c:508
 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:718
 addrconf_rs_timer+0x3ed/0x820 net/ipv6/addrconf.c:3927
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:934 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Allocated by task 1:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593
 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:655
 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:1050
 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x322/0xb10 fs/sysfs/group.c:148
 sysfs_slab_add+0x177/0x1e0 mm/slub.c:5958
 __kmem_cache_create+0x509/0x690 mm/slub.c:4899
 create_cache mm/slab_common.c:229 [inline]
 kmem_cache_create_usercopy+0x1f9/0x300 mm/slab_common.c:335
 kmem_cache_create+0xd/0x10 mm/slab_common.c:390
 br_fdb_init+0x22/0x3f net/bridge/br_fdb.c:38
 br_init+0x44/0x1e1 net/bridge/br.c:388
 do_one_initcall+0xfe/0x650 init/main.c:1296
 do_initcall_level init/main.c:1369 [inline]
 do_initcalls init/main.c:1385 [inline]
 do_basic_setup init/main.c:1404 [inline]
 kernel_init_freeable+0x6b1/0x73a init/main.c:1611
 kernel_init+0x1a/0x1d0 init/main.c:1500
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

The buggy address belongs to the object at ffff888025de3e80
 which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 211 bytes to the right of
 168-byte region [ffff888025de3e80, ffff888025de3f28)

The buggy address belongs to the physical page:
page:ffffea00009778c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25de3
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888140007b40
raw: 0000000000000000 0000000000110011 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 1, tgid 1 (swapper/0), ts 10703909986, free_ts 0
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2103
 alloc_pages+0x22f/0x270 mm/mempolicy.c:2265
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x7f1/0xe10 mm/slub.c:3031
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x38c/0x3b0 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593
 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:655
 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:1050
 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x322/0xb10 fs/sysfs/group.c:148
 netdev_queue_add_kobject net/core/net-sysfs.c:1672 [inline]
 netdev_queue_update_kobjects+0x3aa/0x4e0 net/core/net-sysfs.c:1718
 register_queue_kobjects net/core/net-sysfs.c:1779 [inline]
 netdev_register_kobject+0x330/0x400 net/core/net-sysfs.c:2019
 register_netdevice+0xe01/0x1680 net/core/dev.c:10070
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888025de3e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888025de3f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
>ffff888025de3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff888025de4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888025de4080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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