diff -urNp a/snmplib/keytools.c b/snmplib/keytools.c
--- a/snmplib/keytools.c	2018-11-27 15:04:59.931217024 +0100
+++ b/snmplib/keytools.c	2018-11-27 15:07:50.765672477 +0100
@@ -187,25 +187,25 @@ generate_Ku(const oid * hashtype, u_int
 #else
     ctx = malloc(sizeof(*ctx));
     if (!EVP_MD_CTX_init(ctx))
-        return SNMPERR_GENERR;
+        QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
 #endif
     if (!EVP_DigestInit(ctx, hashfn))
-        return SNMPERR_GENERR;
+        QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
 
 #elif NETSNMP_USE_INTERNAL_CRYPTO
 #ifndef NETSNMP_DISABLE_MD5
     if (NETSNMP_USMAUTH_HMACMD5 == auth_type) {
         if (!MD5_Init(&cmd5))
-            return SNMPERR_GENERR;
+            QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
         cryptotype = TYPE_MD5;
     } else
 #endif
            if (NETSNMP_USMAUTH_HMACSHA1 == auth_type) {
         if (!SHA1_Init(&csha1))
-            return SNMPERR_GENERR;
+            QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
         cryptotype = TYPE_SHA1;
     } else {
-        return (SNMPERR_GENERR);
+        QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
     }
 #else
     MDbegin(&MD);
diff -urNp a/snmplib/scapi.c b/snmplib/scapi.c
--- a/snmplib/scapi.c	2018-11-27 15:04:59.931217024 +0100
+++ b/snmplib/scapi.c	2018-11-27 15:14:37.587393891 +0100
@@ -967,7 +967,8 @@ sc_hash_type(int auth_type, const u_char
 #endif
     if (!EVP_DigestInit(cptr, hashfn)) {
         /* requested hash function is not available */
-        return SNMPERR_SC_NOT_CONFIGURED;
+        rval = SNMPERR_SC_NOT_CONFIGURED;
+        goto sc_hash_type_quit;
     }
 
 /** pass the data */
@@ -976,6 +977,8 @@ sc_hash_type(int auth_type, const u_char
 /** do the final pass */
     EVP_DigestFinal(cptr, MAC, &tmp_len);
     *MAC_len = tmp_len;
+
+sc_hash_type_quit:
 #if defined(HAVE_EVP_MD_CTX_FREE)
     EVP_MD_CTX_free(cptr);
 #elif defined(HAVE_EVP_MD_CTX_DESTROY)