==================================================================
BUG: KASAN: slab-out-of-bounds in __build_skb_around+0x235/0x340 net/core/skbuff.c:294
Write of size 32 at addr ffff88807c5a8ec0 by task syz-executor.5/16445

CPU: 0 PID: 16445 Comm: syz-executor.5 Not tainted 6.1.0-rc8-next-20221207-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:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
 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: 0033:0x7f7918e8c0d9
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:00007f7919b03168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7918fabf80 RCX: 00007f7918e8c0d9
RDX: 0000000000000048 RSI: 00000000200003c0 RDI: 000000000000000a
RBP: 00007f7918ee7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd1785f07f R14: 00007f7919b03300 R15: 0000000000022000
 </TASK>

Allocated by task 16445:
 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:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:968 [inline]
 __kmalloc+0x5a/0xd0 mm/slab_common.c:981
 kmalloc include/linux/slab.h:584 [inline]
 kzalloc include/linux/slab.h:720 [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 ffff88807c5a8000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3776 bytes inside of
 4096-byte region [ffff88807c5a8000, ffff88807c5a9000)

The buggy address belongs to the physical page:
page:ffffea0001f16a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c5a8
head:ffffea0001f16a00 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012442140 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080040004 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5118, tgid 5118 (syz-executor.0), ts 393109051479, free_ts 389564065458
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988
 kmalloc_reserve net/core/skbuff.c:438 [inline]
 __alloc_skb+0xe9/0x310 net/core/skbuff.c:511
 alloc_skb include/linux/skbuff.h:1269 [inline]
 nlmsg_new include/net/netlink.h:1002 [inline]
 rtmsg_ifinfo_build_skb+0x76/0x1b0 net/core/rtnetlink.c:3948
 rtmsg_ifinfo_event net/core/rtnetlink.c:3986 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3976 [inline]
 rtmsg_ifinfo+0x1d0/0x280 net/core/rtnetlink.c:3995
 register_netdevice+0x1235/0x1640 net/core/dev.c:10092
 __ip_tunnel_create+0x398/0x570 net/ipv4/ip_tunnel.c:267
 ip_tunnel_init_net+0x2ec/0x9f0 net/ipv4/ip_tunnel.c:1073
 ops_init+0xb9/0x680 net/core/net_namespace.c:135
 setup_net+0x793/0xe60 net/core/net_namespace.c:333
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1446 [inline]
 free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
 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:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:761 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 kmem_cache_alloc_node+0x1f1/0x460 mm/slub.c:3497
 __alloc_skb+0x216/0x310 net/core/skbuff.c:498
 alloc_skb_fclone include/linux/skbuff.h:1319 [inline]
 tcp_stream_alloc_skb+0x3c/0x580 net/ipv4/tcp.c:862
 tcp_sendmsg_locked+0xc4f/0x2960 net/ipv4/tcp.c:1325
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1483
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 sock_write_iter+0x295/0x3d0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2186 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xa45/0xe40 fs/read_write.c:584
 ksys_write+0x1ec/0x250 fs/read_write.c:637

Memory state around the buggy address:
 ffff88807c5a8d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807c5a8e00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88807c5a8e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff88807c5a8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807c5a8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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