3 files changed, 7 insertions, 7 deletions
diff --git a/main/openvpn/src/openvpn/crypto_backend.h b/main/openvpn/src/openvpn/crypto_backend.h
index bc067a7d..87498785 100644
--- a/main/openvpn/src/openvpn/crypto_backend.h
+++ b/main/openvpn/src/openvpn/crypto_backend.h
@@ -223,7 +223,7 @@ int cipher_kt_block_size (const cipher_kt_t *cipher_kt);
 /**
  * Returns the mode that the cipher runs in.
  *
- * @param cipher_kt 	Static cipher parameters
+ * @param cipher_kt	Static cipher parameters. May not be NULL.
  *
  * @return 		Cipher mode, either \c OPENVPN_MODE_CBC, \c
  * 			OPENVPN_MODE_OFB or \c OPENVPN_MODE_CFB
@@ -233,7 +233,7 @@ int cipher_kt_mode (const cipher_kt_t *cipher_kt);
 /**
  * Check if the supplied cipher is a supported CBC mode cipher.
  *
- * @param cipher	Static cipher parameters. May not be NULL.
+ * @param cipher	Static cipher parameters.
  *
  * @return		true iff the cipher is a CBC mode cipher.
  */
@@ -243,7 +243,7 @@ bool cipher_kt_mode_cbc(const cipher_kt_t *cipher)
 /**
  * Check if the supplied cipher is a supported OFB or CFB mode cipher.
  *
- * @param cipher	Static cipher parameters. May not be NULL.
+ * @param cipher	Static cipher parameters.
  *
  * @return		true iff the cipher is a OFB or CFB mode cipher.
  */
diff --git a/main/openvpn/src/openvpn/crypto_openssl.c b/main/openvpn/src/openvpn/crypto_openssl.c
index 0ac89a19..f7a491d6 100644
--- a/main/openvpn/src/openvpn/crypto_openssl.c
+++ b/main/openvpn/src/openvpn/crypto_openssl.c
@@ -492,7 +492,7 @@ cipher_kt_mode (const EVP_CIPHER *cipher_kt)
 bool
 cipher_kt_mode_cbc(const cipher_kt_t *cipher)
 {
-  return cipher_kt_mode(cipher) == OPENVPN_MODE_CBC
+  return cipher && cipher_kt_mode(cipher) == OPENVPN_MODE_CBC
 #ifdef EVP_CIPH_FLAG_AEAD_CIPHER
       /* Exclude AEAD cipher modes, they require a different API */
       && !(EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
@@ -503,7 +503,7 @@ cipher_kt_mode_cbc(const cipher_kt_t *cipher)
 bool
 cipher_kt_mode_ofb_cfb(const cipher_kt_t *cipher)
 {
-  return (cipher_kt_mode(cipher) == OPENVPN_MODE_OFB ||
+  return cipher && (cipher_kt_mode(cipher) == OPENVPN_MODE_OFB ||
 	  cipher_kt_mode(cipher) == OPENVPN_MODE_CFB)
 #ifdef EVP_CIPH_FLAG_AEAD_CIPHER
       /* Exclude AEAD cipher modes, they require a different API */
diff --git a/main/openvpn/src/openvpn/crypto_polarssl.c b/main/openvpn/src/openvpn/crypto_polarssl.c
index 1a986dbd..e083398f 100644
--- a/main/openvpn/src/openvpn/crypto_polarssl.c
+++ b/main/openvpn/src/openvpn/crypto_polarssl.c
@@ -419,13 +419,13 @@ cipher_kt_mode (const cipher_info_t *cipher_kt)
 bool
 cipher_kt_mode_cbc(const cipher_kt_t *cipher)
 {
-  return cipher_kt_mode(cipher) == OPENVPN_MODE_CBC;
+  return cipher && cipher_kt_mode(cipher) == OPENVPN_MODE_CBC;
 }
 
 bool
 cipher_kt_mode_ofb_cfb(const cipher_kt_t *cipher)
 {
-  return (cipher_kt_mode(cipher) == OPENVPN_MODE_OFB ||
+  return cipher && (cipher_kt_mode(cipher) == OPENVPN_MODE_OFB ||
 	  cipher_kt_mode(cipher) == OPENVPN_MODE_CFB);
 }