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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: slab-out-of-bounds in tgr160_final+0x93/0xe0 crypto/tgr192.c:614
Write of size 20 at addr ffff880180787154 by task syz-executor4/31685

CPU: 0 PID: 31685 Comm: syz-executor4 Not tainted 4.17.0+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:345 [inline]
 tgr160_final+0x93/0xe0 crypto/tgr192.c:614
 crypto_shash_final+0x104/0x260 crypto/shash.c:152
 kdf_ctr security/keys/dh.c:186 [inline]
 keyctl_dh_compute_kdf security/keys/dh.c:217 [inline]
 __keyctl_dh_compute+0x1184/0x1bc0 security/keys/dh.c:389
 compat_keyctl_dh_compute+0x2c8/0x3e0 security/keys/compat_dh.c:39
 __do_compat_sys_keyctl security/keys/compat.c:136 [inline]
 __se_compat_sys_keyctl security/keys/compat.c:59 [inline]
 __ia32_compat_sys_keyctl+0x137/0x3b0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f8ecb9
Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f5f8a0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000017 RCX: 0000000020000200
RDX: 0000000020a53ffb RSI: 0000000000000005 RDI: 00000000200002c0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 31685:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x14e/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:518 [inline]
 keyctl_dh_compute_kdf security/keys/dh.c:211 [inline]
 __keyctl_dh_compute+0xfe9/0x1bc0 security/keys/dh.c:389
 compat_keyctl_dh_compute+0x2c8/0x3e0 security/keys/compat_dh.c:39
 __do_compat_sys_keyctl security/keys/compat.c:136 [inline]
 __se_compat_sys_keyctl security/keys/compat.c:59 [inline]
 __ia32_compat_sys_keyctl+0x137/0x3b0 security/keys/compat.c:59
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 4539:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 kvfree+0x61/0x70 mm/util.c:442
 __vunmap+0x326/0x460 mm/vmalloc.c:1529
 vfree+0x68/0x100 mm/vmalloc.c:1593
 xt_compat_flush_offsets+0x14e/0x270 net/netfilter/x_tables.c:674
 get_info+0x5cf/0x700 net/ipv6/netfilter/ip6_tables.c:992
 compat_do_ip6t_get_ctl+0x3a5/0xd00 net/ipv6/netfilter/ip6_tables.c:1661
 compat_nf_sockopt net/netfilter/nf_sockopt.c:139 [inline]
 compat_nf_getsockopt+0x9e/0x140 net/netfilter/nf_sockopt.c:163
 compat_ipv6_getsockopt+0x257/0x3c0 net/ipv6/ipv6_sockglue.c:1409
 inet_csk_compat_getsockopt+0x97/0x120 net/ipv4/inet_connection_sock.c:1023
 compat_tcp_getsockopt+0x49/0x80 net/ipv4/tcp.c:3545
 compat_sock_common_getsockopt+0xb4/0x150 net/core/sock.c:3023
 __compat_sys_getsockopt+0x1ae/0x880 net/compat.c:532
 __do_compat_sys_socketcall net/compat.c:916 [inline]
 __se_compat_sys_socketcall net/compat.c:844 [inline]
 __ia32_compat_sys_socketcall+0xcd1/0x1070 net/compat.c:844
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

The buggy address belongs to the object at ffff880180787140
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 20 bytes inside of
 32-byte region [ffff880180787140, ffff880180787160)
The buggy address belongs to the page:
page:ffffea000601e1c0 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff880180787fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea000628fa48 ffffea0006dc8b48 ffff8801da8001c0
raw: ffff880180787fc1 ffff880180787000 000000010000001c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880180787000: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff880180787080: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
>ffff880180787100: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
                                                    ^
 ffff880180787180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff880180787200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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