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BUG: KASAN: slab-out-of-bounds in asn1_ber_decoder+0x1436/0x1c20 lib/asn1_decoder.c:233
Read of size 1 at addr ffff8801d5d7cb02 by task syz-executor7/10890

CPU: 0 PID: 10890 Comm: syz-executor7 Not tainted 4.14.0-rc5-mm1+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 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_load1_noabort+0x14/0x20 mm/kasan/report.c:427
 asn1_ber_decoder+0x1436/0x1c20 lib/asn1_decoder.c:233
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=258 sclass=netlink_route_socket pig=10905 comm=syz-executor4
 x509_cert_parse+0x1dd/0x680 crypto/asymmetric_keys/x509_cert_parser.c:89
 x509_key_preparse+0x64/0x8b0 crypto/asymmetric_keys/x509_public_key.c:174
 asymmetric_key_preparse+0xa8/0x110 crypto/asymmetric_keys/asymmetric_type.c:386
 key_create_or_update+0x4c6/0xe20 security/keys/key.c:846
 SYSC_add_key security/keys/keyctl.c:122 [inline]
 SyS_add_key+0x18a/0x340 security/keys/keyctl.c:62
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007f0abdc29be8 EFLAGS: 00000212 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 00000000201d9000 RSI: 00000000205ceffb RDI: 0000000020825ff5
RBP: 0000000000000082 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000212 R12: 00000000006f3d58
R13: 00000000ffffffff R14: 00007f0abdc2a6d4 R15: 0000000000000000

Allocated by task 10890:
 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
 __do_kmalloc_node mm/slab.c:3676 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3683
 kmalloc_node include/linux/slab.h:541 [inline]
 kvmalloc_node+0x99/0xd0 mm/util.c:397
 kvmalloc include/linux/mm.h:538 [inline]
 SYSC_add_key security/keys/keyctl.c:104 [inline]
 SyS_add_key+0x279/0x340 security/keys/keyctl.c:62
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 8598:
 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:3492 [inline]
 kfree+0xca/0x250 mm/slab.c:3807
 dccp_feat_val_destructor+0xd2/0xf0 net/dccp/feat.c:388
 dccp_feat_entry_destructor.part.5+0x40/0x60 net/dccp/feat.c:417
 dccp_feat_entry_destructor net/dccp/feat.c:416 [inline]
 dccp_feat_list_purge+0xc2/0x1e0 net/dccp/feat.c:549
 dccp_destroy_sock+0x2f4/0x3f0 net/dccp/proto.c:236
 dccp_v6_destroy_sock+0x15/0x20 net/dccp/ipv6.c:1017
 inet_csk_destroy_sock+0x166/0x3f0 net/ipv4/inet_connection_sock.c:836
 dccp_close+0x84d/0xc10 net/dccp/proto.c:1074
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:433
 sock_release+0x8d/0x1e0 net/socket.c:596
 sock_close+0x16/0x20 net/socket.c:1125
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:112
 exit_task_work include/linux/task_work.h:21 [inline]
 do_exit+0x9b5/0x1ad0 kernel/exit.c:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16d0 kernel/signal.c:2333
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe

The buggy address belongs to the object at ffff8801d5d7cb00
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 2 bytes inside of
 32-byte region [ffff8801d5d7cb00, ffff8801d5d7cb20)
The buggy address belongs to the page:
page:ffffea0007575f00 count:1 mapcount:0 mapping:ffff8801d5d7c000 index:0xffff8801d5d7cfc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801d5d7c000 ffff8801d5d7cfc1 000000010000003f
raw: ffffea00075455e0 ffffea0007523a60 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d5d7ca00: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
 ffff8801d5d7ca80: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d5d7cb00: 02 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8801d5d7cb80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d5d7cc00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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