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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 wp384_final+0x93/0xe0 crypto/wp512.c:1105
Write of size 48 at addr ffff88018daf88f0 by task syz-executor4/15228

CPU: 1 PID: 15228 Comm: syz-executor4 Not tainted 4.18.0-rc1+ #12
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+0x1c9/0x2b4 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]
 wp384_final+0x93/0xe0 crypto/wp512.c:1105
 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+0x1198/0x1be0 security/keys/dh.c:389
 compat_keyctl_dh_compute+0x2d0/0x400 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+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fcccb9
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:00000000f5fc80ac EFLAGS: 00000282 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000017 RCX: 00000000200003c0
RDX: 0000000020000400 RSI: 00000000000000f8 RDI: 0000000020000600
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 15228:
 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+0x1000/0x1be0 security/keys/dh.c:389
 compat_keyctl_dh_compute+0x2d0/0x400 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+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 13868:
 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
 free_bprm+0x1b1/0x210 fs/exec.c:1429
 __do_execve_file.isra.35+0x1e29/0x2730 fs/exec.c:1830
 do_execveat_common fs/exec.c:1866 [inline]
 do_execve fs/exec.c:1883 [inline]
 __do_sys_execve fs/exec.c:1964 [inline]
 __se_sys_execve fs/exec.c:1959 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88018daf8800
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 240 bytes inside of
 256-byte region [ffff88018daf8800, ffff88018daf8900)
The buggy address belongs to the page:
page:ffffea000636be00 count:1 mapcount:0 mapping:ffff8801da8007c0 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea0006b227c8 ffffea000716f5c8 ffff8801da8007c0
raw: 0000000000000000 ffff88018daf8080 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88018daf8800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018daf8880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88018daf8900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                   ^
 ffff88018daf8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88018daf8a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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