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BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x677/0xcf0
Write of size 8 at addr ffff88811a1ad258 by task syz.2.66/6117

CPU: 1 UID: 0 PID: 6117 Comm: syz.2.66 Not tainted 6.17.0-rc1-syzkaller-00022-g07866544e410-dirty #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
 push_stack+0x19d/0x390
 check_cond_jmp_op+0x1469/0x2910
 do_check+0x6751/0xe520
 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: 0033:0x7f70d938ebe9
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:00007f70d75f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f70d95b5fa0 RCX: 00007f70d938ebe9
RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005
RBP: 00007f70d9411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70d95b6038 R14: 00007f70d95b5fa0 R15: 00007ffe64973388
 </TASK>

Allocated by task 6117:
 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 ffff88811a1ad000
 which belongs to the cache kmalloc-cg-1k of size 1024
The buggy address is located 24 bytes to the right of
 allocated 576-byte region [ffff88811a1ad000, ffff88811a1ad240)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a1a8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88810d837b01
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a44b280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 ffff88810d837b01
head: 057ff00000000040 ffff88801a44b280 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 ffff88810d837b01
head: 057ff00000000003 ffffea0004686a01 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 5954, tgid 5953 (syz.2.12), ts 57696770328, free_ts 0
 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
 tun_set_iff+0x844/0xef0
 __tun_chr_ioctl+0x788/0x1df0
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811a1ad100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811a1ad180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811a1ad200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                                    ^
 ffff88811a1ad280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811a1ad300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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