From 137b9da5c845d579387c02f67dfe94fa2279c024 Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date: Thu, 9 May 2019 21:42:59 -0400
Subject: [PATCH] tpm2: Reset the internal CMAC state when starting a CMAC

Initialize the internal CMAC state to 0s when starting a CMAC.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 src/tpm2/crypto/openssl/CryptCmac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/tpm2/crypto/openssl/CryptCmac.c b/src/tpm2/crypto/openssl/CryptCmac.c
index 847c4bc8..e16f066e 100644
--- a/src/tpm2/crypto/openssl/CryptCmac.c
+++ b/src/tpm2/crypto/openssl/CryptCmac.c
@@ -87,6 +87,7 @@ CryptCmacStart(
     //
     if(macAlg != TPM_ALG_CMAC)
 	return 0;
+    MemorySet(cState, 0, sizeof(*cState));
     // set up the encryption algorithm and parameters
     cState->symAlg = def->algorithm;
     cState->keySizeBits = def->keyBits.sym;