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BUG: KASAN: use-after-free in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: use-after-free in array_map_update_elem+0x197/0x240 kernel/bpf/arraymap.c:249
Write of size 1 at addr ffff8801cac19bc0 by task syz-executor7/3402

CPU: 1 PID: 3402 Comm: syz-executor7 Not tainted 4.15.0-rc7+ #186
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 array_map_update_elem+0x197/0x240 kernel/bpf/arraymap.c:249
 map_update_elem kernel/bpf/syscall.c:687 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1811 [inline]
 SyS_bpf+0x32df/0x4400 kernel/bpf/syscall.c:1782
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f32f4f94c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000020 RSI: 0000000020eaf000 RDI: 0000000000000002
RBP: 0000000000000036 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee5b0
R13: 00000000ffffffff R14: 00007f32f4f956d4 R15: 0000000000000000

Allocated by task 1889:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3610
 kmalloc include/linux/slab.h:499 [inline]
 kzalloc include/linux/slab.h:688 [inline]
 htab_map_alloc+0x1ea/0x1200 kernel/bpf/hashtab.c:272
 find_and_alloc_map kernel/bpf/syscall.c:105 [inline]
 map_create kernel/bpf/syscall.c:404 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1805 [inline]
 SyS_bpf+0x7f8/0x4400 kernel/bpf/syscall.c:1782
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 6126:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 htab_map_free+0x171/0x640 kernel/bpf/hashtab.c:1142
 bpf_map_free_deferred+0xb0/0xe0 kernel/bpf/syscall.c:217
 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

The buggy address belongs to the object at ffff8801cac19b00
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 192 bytes inside of
 1024-byte region [ffff8801cac19b00, ffff8801cac19f00)
The buggy address belongs to the page:
page:ffffea00072b0600 count:1 mapcount:0 mapping:ffff8801cac18000 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801cac18000 0000000000000000 0000000100000007
raw: ffffea00073511a0 ffffea0007530320 ffff8801dac00ac0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cac19a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801cac19b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801cac19b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8801cac19c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cac19c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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