==================================================================
BUG: KASAN: slab-out-of-bounds in __build_skb_around+0x235/0x340 net/core/skbuff.c:294
Write of size 32 at addr ffff888029d642c0 by task syz-executor.0/9834

CPU: 0 PID: 9834 Comm: syz-executor.0 Not tainted 6.1.0-rc6-next-20221124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:253 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:364
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:464
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x141/0x190 mm/kasan/generic.c:189
 memset+0x24/0x50 mm/kasan/shadow.c:44
 __build_skb_around+0x235/0x340 net/core/skbuff.c:294
 __build_skb+0x4f/0x60 net/core/skbuff.c:328
 build_skb+0x22/0x280 net/core/skbuff.c:340
 bpf_prog_test_run_skb+0x343/0x1e10 net/bpf/test_run.c:1131
 bpf_prog_test_run kernel/bpf/syscall.c:3644 [inline]
 __sys_bpf+0x1599/0x4ff0 kernel/bpf/syscall.c:4997
 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5081 [inline]
 __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5081
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7e1628c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7e155ff168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7e163abf80 RCX: 00007f7e1628c0d9
RDX: 0000000000000048 RSI: 0000000020000340 RDI: 000000000000000a
RBP: 00007f7e162e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe616364af R14: 00007f7e155ff300 R15: 0000000000022000
 </TASK>

Allocated by task 9834:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:376 [inline]
 ____kasan_kmalloc mm/kasan/common.c:335 [inline]
 __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:385
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc+0x5a/0xd0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:575 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 bpf_test_init.isra.0+0xa5/0x150 net/bpf/test_run.c:778
 bpf_prog_test_run_skb+0x22e/0x1e10 net/bpf/test_run.c:1097
 bpf_prog_test_run kernel/bpf/syscall.c:3644 [inline]
 __sys_bpf+0x1599/0x4ff0 kernel/bpf/syscall.c:4997
 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5081 [inline]
 __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5081
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888029d64000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 704 bytes inside of
 1024-byte region [ffff888029d64000, ffff888029d64400)

The buggy address belongs to the physical page:
page:ffffea0000a75800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29d60
head:ffffea0000a75800 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012441dc0 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 7, tgid 7 (kworker/0:0), ts 154437001716, free_ts 154397859381
 prep_new_page mm/page_alloc.c:2541 [inline]
 get_page_from_freelist+0x119c/0x2cd0 mm/page_alloc.c:4293
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5551
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1833 [inline]
 allocate_slab+0x25e/0x350 mm/slub.c:1980
 new_slab mm/slub.c:2033 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3211
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310
 slab_alloc_node mm/slub.c:3395 [inline]
 __kmem_cache_alloc_node+0x1a9/0x430 mm/slub.c:3472
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc+0x4a/0xd0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:575 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 neigh_alloc net/core/neighbour.c:476 [inline]
 ___neigh_create+0x1578/0x2a20 net/core/neighbour.c:661
 ip6_finish_output2+0xfc4/0x1530 net/ipv6/ip6_output.c:125
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:444 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xa63/0x1740 net/ipv6/ndisc.c:508
 ndisc_send_rs+0x132/0x6f0 net/ipv6/ndisc.c:718
 addrconf_dad_completed+0x37a/0xda0 net/ipv6/addrconf.c:4248
 addrconf_dad_begin net/ipv6/addrconf.c:4014 [inline]
 addrconf_dad_work+0x820/0x12d0 net/ipv6/addrconf.c:4116
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1448 [inline]
 free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1498
 free_unref_page_prepare mm/page_alloc.c:3379 [inline]
 free_unref_page+0x1d/0x490 mm/page_alloc.c:3474
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:307
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook mm/slab.h:761 [inline]
 slab_alloc_node mm/slub.c:3433 [inline]
 slab_alloc mm/slub.c:3441 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3448 [inline]
 kmem_cache_alloc+0x1e3/0x430 mm/slub.c:3457
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
 getname_flags include/linux/audit.h:320 [inline]
 getname+0x92/0xd0 fs/namei.c:218
 do_sys_openat2+0xf5/0x4c0 fs/open.c:1304
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888029d64180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888029d64200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888029d64280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff888029d64300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888029d64380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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