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BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x868/0xcf0
Write of size 8 at addr ffff888121d7f648 by task syz.2.322/7044

CPU: 1 UID: 0 PID: 7044 Comm: syz.2.322 Not tainted syzkaller #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+0x868/0xcf0
 bpf_get_stackid_raw_tp+0x196/0x210
 bpf_prog_12712c88fd19bd5b+0x2a/0x32
 bpf_trace_run4+0x28e/0x4a0
 trace_mm_page_alloc+0x129/0x150
 __alloc_frozen_pages_noprof+0x1d6/0x370
 alloc_pages_bulk_noprof+0x560/0x710
 kasan_populate_vmalloc+0xba/0x1a0
 alloc_vmap_area+0xd51/0x1490
 __get_vm_area_node+0x1f8/0x300
 vmap+0x162/0x310
 bpf_ringbuf_alloc+0x341/0x590
 ringbuf_map_alloc+0x1c8/0x2f0
 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
RIP: 0033:0x7fd87e58ebe9
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:00007fd87f38c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd87e7c5fa0 RCX: 00007fd87e58ebe9
RDX: 0000000000000048 RSI: 00002000000007c0 RDI: 0000000000000000
RBP: 00007fd87e611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd87e7c6038 R14: 00007fd87e7c5fa0 R15: 00007ffc332fd948
 </TASK>

Allocated by task 7044:
 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 ffff888121d7f000
 which belongs to the cache kmalloc-cg-2k of size 2048
The buggy address is located 8 bytes to the right of
 allocated 1600-byte region [ffff888121d7f000, ffff888121d7f640)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121d78
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881082d5181
anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a44b3c0 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000000f5000000 ffff8881082d5181
head: 057ff00000000040 ffff88801a44b3c0 0000000000000000 dead000000000001
head: 0000000000000000 0000000000080008 00000000f5000000 ffff8881082d5181
head: 057ff00000000003 ffffea0004875e01 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 6760, tgid 6759 (syz.0.239), ts 102839013720, free_ts 102780959290
 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_node_track_caller_noprof+0x2f8/0x4e0
 kmemdup_noprof+0x2b/0x70
 __devinet_sysctl_register+0xa5/0x470
 devinet_sysctl_register+0x187/0x200
 inetdev_init+0x2b4/0x500
 inetdev_event+0x301/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 register_netdev+0x40/0x60
 loopback_net_init+0x75/0x150
page last free pid 5296 tgid 5296 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 getname_flags+0xb8/0x540
 do_sys_openat2+0xbc/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888121d7f500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888121d7f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888121d7f600: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                              ^
 ffff888121d7f680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888121d7f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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