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BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:341 [inline]
BUG: KASAN: stack-out-of-bounds in sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
Write of size 4096 at addr ffff8801cc8d7ae8 by task syzkaller208172/3048

CPU: 1 PID: 3048 Comm: syzkaller208172 Not tainted 4.14.0+ #102
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:341 [inline]
 sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
 crypto_shash_update+0xcb/0x220 crypto/shash.c:109
 shash_finup_unaligned+0x2a/0x60 crypto/shash.c:151
 crypto_shash_finup+0xc4/0x120 crypto/shash.c:165
 hmac_finup+0x182/0x330 crypto/hmac.c:152
 crypto_shash_finup+0xc4/0x120 crypto/shash.c:165
 shash_digest_unaligned+0x9e/0xd0 crypto/shash.c:172
 crypto_shash_digest+0xc4/0x120 crypto/shash.c:186
 hmac_setkey+0x36a/0x690 crypto/hmac.c:66
 crypto_shash_setkey+0xad/0x190 crypto/shash.c:64
 shash_async_setkey+0x47/0x60 crypto/shash.c:207
 crypto_ahash_setkey+0xaf/0x180 crypto/ahash.c:200
 hash_setkey+0x40/0x90 crypto/algif_hash.c:446
 alg_setkey crypto/af_alg.c:221 [inline]
 alg_setsockopt+0x2a1/0x350 crypto/af_alg.c:254
 C_SYSC_setsockopt net/compat.c:406 [inline]
 compat_SyS_setsockopt+0x2e7/0x410 net/compat.c:386
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7fd8c79
RSP: 002b:00000000fffd3d2c EFLAGS: 00000282 ORIG_RAX: 000000000000016e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000117
RDX: 0000000000000001 RSI: 0000000020ea5000 RDI: 0000000000001000
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00073235c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cc8d7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cc8d7c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801cc8d7d00: 00 00 00 00 00 f1 f1 f1 f1 04 f2 f2 f2 f3 f3 f3
                                  ^
 ffff8801cc8d7d80: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cc8d7e00: f1 f1 f1 f1 f8 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2
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