syzbot

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BUG: KMSAN: uninit-value in __twofish_setkey+0x269/0xa150 crypto/twofish_common.c:609
CPU: 0 PID: 3580 Comm: syzkaller999392 Not tainted 4.16.0+ #84
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+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 __twofish_setkey+0x269/0xa150 crypto/twofish_common.c:609
 twofish_setkey+0x9a/0xb0 crypto/twofish_common.c:704
 setkey+0x50f/0x5a0 crypto/cipher.c:60
 crypto_cipher_setkey include/linux/crypto.h:1552 [inline]
 crypto_xcbc_digest_setkey+0x4b7/0x570 crypto/xcbc.c:77
 crypto_shash_setkey crypto/shash.c:66 [inline]
 shash_async_setkey+0x337/0x4c0 crypto/shash.c:218
 crypto_ahash_setkey+0x31a/0x470 crypto/ahash.c:201
 hash_setkey+0x8b/0xa0 crypto/algif_hash.c:420
 alg_setkey crypto/af_alg.c:223 [inline]
 alg_setsockopt+0x6c5/0x740 crypto/af_alg.c:256
 SYSC_setsockopt+0x4b8/0x570 net/socket.c:1849
 SyS_setsockopt+0x76/0xa0 net/socket.c:1828
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43fdb9
RSP: 002b:00007ffcbb8a1fb8 EFLAGS: 00000217 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9
RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8
R10: 0000000020000400 R11: 0000000000000217 R12: 00000000004016e0
R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----vla@crypto_xcbc_digest_setkey
Variable was created at:
 crypto_xcbc_digest_setkey+0x12e/0x570 crypto/xcbc.c:68
 crypto_shash_setkey crypto/shash.c:66 [inline]
 shash_async_setkey+0x337/0x4c0 crypto/shash.c:218
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