==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x868/0xcf0
Write of size 8 at addr ffff88801f8f7648 by task syz.5.2923/15985

CPU: 0 UID: 0 PID: 15985 Comm: syz.5.2923 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_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 kmem_cache_alloc_bulk_noprof+0x20e/0x790
 bpf_test_run_xdp_live+0x15f1/0x1b10
 bpf_prog_test_run_xdp+0x713/0x1000
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x581/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9df98ebe9
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:00007fc9e075d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc9dfbb5fa0 RCX: 00007fc9df98ebe9
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007fc9dfa11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9dfbb6038 R14: 00007fc9dfbb5fa0 R15: 00007fffb59c2128
 </TASK>

Allocated by task 15985:
 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 ffff88801f8f7000
 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 [ffff88801f8f7000, ffff88801f8f7640)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f8f0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888022e26181
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a44b3c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000080008 00000000f5000000 ffff888022e26181
head: 00fff00000000040 ffff88801a44b3c0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000080008 00000000f5000000 ffff888022e26181
head: 00fff00000000003 ffffea00007e3c01 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 7596, tgid 7596 (syz-executor), ts 100172426554, free_ts 98001209179
 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
 __devinet_sysctl_register+0x37f/0x470
 devinet_sysctl_register+0x187/0x200
 inetdev_init+0x2b4/0x500
 inetdev_event+0x301/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 veth_newlink+0x42f/0xa50
 rtnl_newlink_create+0x310/0xb00
page last free pid 7559 tgid 7559 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_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 inet_netconf_notify_devconf+0x173/0x240
 inetdev_event+0x77f/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 unregister_netdevice_many_notify+0x14d7/0x1ff0
 unregister_netdevice_queue+0x33c/0x380
 __tun_detach+0xda4/0x1560

Memory state around the buggy address:
 ffff88801f8f7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801f8f7580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801f8f7600: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                              ^
 ffff88801f8f7680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801f8f7700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
