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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: slab-out-of-bounds in array_map_update_elem+0x197/0x240 kernel/bpf/arraymap.c:249
Write of size 1 at addr ffff8801beb66380 by task syz-executor4/11112

CPU: 1 PID: 11112 Comm: syz-executor4 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:00007fbfb8680c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fbfb8681700 RCX: 0000000000452ac9
RDX: 0000000000000020 RSI: 0000000020eaf000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007fbfb86819c0 R15: 0000000000000000

Allocated by task 11046:
 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_flags+0xcb/0x580 fs/namei.c:138
 user_path_at_empty+0x2d/0x50 fs/namei.c:2590
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xe9/0x190 fs/stat.c:185
 vfs_fstatat include/linux/fs.h:3091 [inline]
 SYSC_newfstatat+0x90/0x100 fs/stat.c:364
 SyS_newfstatat+0x2c/0x40 fs/stat.c:358
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 11046:
 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
 filename_lookup+0x315/0x500 fs/namei.c:2345
 user_path_at_empty+0x40/0x50 fs/namei.c:2590
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xe9/0x190 fs/stat.c:185
 vfs_fstatat include/linux/fs.h:3091 [inline]
 SYSC_newfstatat+0x90/0x100 fs/stat.c:364
 SyS_newfstatat+0x2c/0x40 fs/stat.c:358
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801beb66e80
 which belongs to the cache names_cache of size 4096
The buggy address is located 2816 bytes to the left of
 4096-byte region [ffff8801beb66e80, ffff8801beb67e80)
The buggy address belongs to the page:
page:ffffea0006fad980 count:1 mapcount:0 mapping:ffff8801beb66e80 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801beb66e80 0000000000000000 0000000100000001
raw: ffffea0006f808a0 ffffea0006faf4a0 ffff8801dae2c600 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801beb66280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801beb66300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801beb66380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801beb66400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801beb66480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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