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BUG: KMSAN: uninit-value in __crypto_memneq_16 crypto/memneq.c:99 [inline]
BUG: KMSAN: uninit-value in __crypto_memneq+0x2f9/0x490 crypto/memneq.c:161
CPU: 1 PID: 5394 Comm: syz-executor5 Not tainted 4.16.0+ #83
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
 __crypto_memneq_16 crypto/memneq.c:99 [inline]
 __crypto_memneq+0x2f9/0x490 crypto/memneq.c:161
 crypto_memneq include/crypto/algapi.h:410 [inline]
 gcmaes_decrypt+0x8d5/0xea0 arch/x86/crypto/aesni-intel_glue.c:858
 generic_gcmaes_decrypt+0x181/0x1e0 arch/x86/crypto/aesni-intel_glue.c:1127
 crypto_aead_decrypt include/crypto/aead.h:370 [inline]
 gcmaes_wrapper_decrypt+0x2f5/0x340 arch/x86/crypto/aesni-intel_glue.c:961
 _aead_recvmsg include/crypto/aead.h:370 [inline]
 aead_recvmsg+0x25b5/0x2960 crypto/algif_aead.c:334
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg net/socket.c:810 [inline]
 sock_read_iter+0x405/0x480 net/socket.c:887
 call_read_iter include/linux/fs.h:1776 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 __vfs_read+0x6fb/0x8e0 fs/read_write.c:413
 vfs_read+0x36c/0x6c0 fs/read_write.c:447
 SYSC_read+0x172/0x360 fs/read_write.c:573
 SyS_read+0x55/0x80 fs/read_write.c:566
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455279
RSP: 002b:00007f2f39c4fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f2f39c506d4 RCX: 0000000000455279
RDX: 00000000000000b4 RSI: 0000000020000300 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000487 R14: 00000000006f9d48 R15: 0000000000000000

Local variable description: ----authTag@gcmaes_decrypt
Variable was created at:
 gcmaes_decrypt+0xd6/0xea0 arch/x86/crypto/aesni-intel_glue.c:811
 generic_gcmaes_decrypt+0x181/0x1e0 arch/x86/crypto/aesni-intel_glue.c:1127
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