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BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x677/0xcf0
Write of size 8 at addr ffff888109af0a48 by task syz.2.506/7894

CPU: 1 UID: 0 PID: 7894 Comm: syz.2.506 Not tainted 6.17.0-rc1-syzkaller-00022-g07866544e410 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 __bpf_get_stackid+0x677/0xcf0
 bpf_get_stackid_raw_tp+0x196/0x210
 bpf_prog_b724608cae728045+0x27/0x2f
 bpf_trace_run2+0x284/0x4b0
 kfree+0x3a0/0x440
 krealloc_noprof+0x1cd/0x340
 copy_array+0x63/0xf0
 copy_verifier_state+0xaf/0xf10
 do_check+0x4017/0xe520
 do_check_common+0x1949/0x24f0
 bpf_check+0x1746a/0x1d2e0
 bpf_prog_load+0x1318/0x1930
 __sys_bpf+0x528/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f658898ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f658978b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6588bb5fa0 RCX: 00007f658898ebe9
RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005
RBP: 00007f6588a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6588bb6038 R14: 00007f6588bb5fa0 R15: 00007ffea1255a58
 </TASK>

Allocated by task 7894:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_noprof+0x276/0x4e0
 bpf_map_area_alloc+0x64/0x180
 prealloc_elems_and_freelist+0x86/0x1d0
 stack_map_alloc+0x33f/0x4c0
 map_create+0xaa3/0x14d0
 __sys_bpf+0x60f/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888109af0800
 which belongs to the cache kmalloc-cg-1k of size 1024
The buggy address is located 8 bytes to the right of
 allocated 576-byte region [ffff888109af0800, ffff888109af0a40)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109af0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88810e290301
anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a44b280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080100010 00000000f5000000 ffff88810e290301
head: 057ff00000000040 ffff88801a44b280 0000000000000000 dead000000000001
head: 0000000000000000 0000000080100010 00000000f5000000 ffff88810e290301
head: 057ff00000000003 ffffea000426bc01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
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 6769, tgid 6769 (syz-executor), ts 89189048613, free_ts 89080357794
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 __kmalloc_noprof+0x305/0x4f0
 __register_sysctl_table+0x72/0x1340
 neigh_sysctl_register+0x9a2/0xa80
 addrconf_sysctl_register+0xb3/0x1c0
 ipv6_add_dev+0xd46/0x1370
 addrconf_notify+0x794/0x1010
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 nsim_create+0xae8/0xf10
 __nsim_dev_port_add+0x6b6/0xb10
page last free pid 6769 tgid 6769 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __slab_free+0x303/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x1be/0x3d0
 ref_tracker_alloc+0x133/0x460
 netdev_queue_update_kobjects+0x1d1/0x6c0
 netdev_register_kobject+0x258/0x310
 register_netdevice+0x126c/0x1ae0
 veth_newlink+0x5cc/0xa50
 rtnl_newlink_create+0x310/0xb00
 rtnl_newlink+0x16d6/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0

Memory state around the buggy address:
 ffff888109af0900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888109af0980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888109af0a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                              ^
 ffff888109af0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888109af0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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