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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 ffff8801c4ccd4c0 by task syz-executor4/5411

CPU: 0 PID: 5411 Comm: syz-executor4 Not tainted 4.15.0-rc7+ #187
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: 0033:0x452cf9
RSP: 002b:00007f9576ceac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f9576ceb700 RCX: 0000000000452cf9
RDX: 0000000000000020 RSI: 0000000020eaf000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f9576ceb9c0 R15: 0000000000000000

Allocated by task 4268:
 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
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
 getname_kernel+0x54/0x340 fs/namei.c:218
 open_exec+0x17/0x60 fs/exec.c:877
 load_elf_binary+0x1348/0x4c10 fs/binfmt_elf.c:775
 search_binary_handler+0x142/0x6b0 fs/exec.c:1638
 exec_binprm fs/exec.c:1680 [inline]
 do_execveat_common.isra.30+0x1754/0x23c0 fs/exec.c:1802
 do_execve fs/exec.c:1847 [inline]
 SYSC_execve fs/exec.c:1928 [inline]
 SyS_execve+0x39/0x50 fs/exec.c:1923
 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285
 return_from_SYSCALL_64+0x0/0x75

Freed by task 4268:
 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]
 kmem_cache_free+0x83/0x2a0 mm/slab.c:3746
 putname+0xee/0x130 fs/namei.c:258
 open_exec+0x41/0x60 fs/exec.c:882
 load_elf_binary+0x1348/0x4c10 fs/binfmt_elf.c:775
 search_binary_handler+0x142/0x6b0 fs/exec.c:1638
 exec_binprm fs/exec.c:1680 [inline]
 do_execveat_common.isra.30+0x1754/0x23c0 fs/exec.c:1802
 do_execve fs/exec.c:1847 [inline]
 SYSC_execve fs/exec.c:1928 [inline]
 SyS_execve+0x39/0x50 fs/exec.c:1923
 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285
 return_from_SYSCALL_64+0x0/0x75

The buggy address belongs to the object at ffff8801c4ccc940
 which belongs to the cache names_cache of size 4096
The buggy address is located 2944 bytes inside of
 4096-byte region [ffff8801c4ccc940, ffff8801c4ccd940)
The buggy address belongs to the page:
page:ffffea0007133300 count:1 mapcount:0 mapping:ffff8801c4ccc940 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801c4ccc940 0000000000000000 0000000100000001
raw: ffffea00071334a0 ffffea0007309a20 ffff8801dae2c600 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c4ccd380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c4ccd400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c4ccd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8801c4ccd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c4ccd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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