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BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:183 [inline]
BUG: KASAN: slab-out-of-bounds in bpf_fd_array_map_lookup_elem+0x440/0x4c0 kernel/bpf/arraymap.c:374
Read of size 8 at addr ffff8801c65565e0 by task syz-executor7/17051

CPU: 1 PID: 17051 Comm: syz-executor7 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
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:183 [inline]
 bpf_fd_array_map_lookup_elem+0x440/0x4c0 kernel/bpf/arraymap.c:374
 map_lookup_elem+0x6b5/0xbd0 kernel/bpf/syscall.c:577
 SYSC_bpf kernel/bpf/syscall.c:1808 [inline]
 SyS_bpf+0x922/0x4400 kernel/bpf/syscall.c:1782
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452cf9
RSP: 002b:00007f0aaa3efc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452cf9
RDX: 0000000000000018 RSI: 0000000020feffe8 RDI: 0000000000000001
RBP: 0000000000000037 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee5c8
R13: 00000000ffffffff R14: 00007f0aaa3f06d4 R15: 0000000000000000

Allocated by task 15297:
 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
 kmem_cache_zalloc include/linux/slab.h:678 [inline]
 ebitmap_cpy+0xce/0x260 security/selinux/ss/ebitmap.c:60
 mls_context_cpy security/selinux/ss/context.h:51 [inline]
 mls_compute_sid+0x555/0x930 security/selinux/ss/mls.c:556
 security_compute_sid+0x8df/0x18f0 security/selinux/ss/services.c:1724
 security_transition_sid+0x75/0x90 security/selinux/ss/services.c:1763
 socket_sockcreate_sid security/selinux/hooks.c:4335 [inline]
 selinux_socket_create+0x3cf/0x740 security/selinux/hooks.c:4368
 security_socket_create+0x83/0xc0 security/security.c:1338
 __sock_create+0xf7/0x850 net/socket.c:1214
 sock_create net/socket.c:1299 [inline]
 SYSC_socketpair net/socket.c:1383 [inline]
 SyS_socketpair+0x1c0/0x6f0 net/socket.c:1340
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 15297:
 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
 ebitmap_destroy+0x79/0xe0 security/selinux/ss/ebitmap.c:338
 mls_context_destroy security/selinux/ss/context.h:109 [inline]
 context_destroy security/selinux/ss/context.h:148 [inline]
 security_compute_sid+0xa46/0x18f0 security/selinux/ss/services.c:1742
 security_transition_sid+0x75/0x90 security/selinux/ss/services.c:1763
 socket_sockcreate_sid security/selinux/hooks.c:4335 [inline]
 selinux_socket_create+0x3cf/0x740 security/selinux/hooks.c:4368
 security_socket_create+0x83/0xc0 security/security.c:1338
 __sock_create+0xf7/0x850 net/socket.c:1214
 sock_create net/socket.c:1299 [inline]
 SYSC_socketpair net/socket.c:1383 [inline]
 SyS_socketpair+0x1c0/0x6f0 net/socket.c:1340
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801c65565a0
 which belongs to the cache ebitmap_node of size 64
The buggy address is located 0 bytes to the right of
 64-byte region [ffff8801c65565a0, ffff8801c65565e0)
The buggy address belongs to the page:
page:ffffea0007195580 count:1 mapcount:0 mapping:ffff8801c6556000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c6556000 0000000000000000 000000010000002a
raw: ffffea00072b90e0 ffffea0006f4e660 ffff8801d2c2a3c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c6556480: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
 ffff8801c6556500: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8801c6556580: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc
                                                       ^
 ffff8801c6556600: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
 ffff8801c6556680: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb
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