Various Coverity fixes

Author: embhorn

src/ssl_load.c

@@ -1560,7 +1560,9 @@ static void ProcessBufferCertSetHave(WOLFSSL_CTX* ctx, WOLFSSL* ssl,
     }
     #endif
 #ifndef WC_STRICT_SIG
-    wolfssl_set_have_from_key_oid(ctx, ssl, cert->keyOID);
+    if ((ctx != NULL) || (ssl != NULL)) {
+        wolfssl_set_have_from_key_oid(ctx, ssl, cert->keyOID);
+    }
 #else
     /* Set whether ECC is available based on signature available. */
     if (ssl != NULL) {

src/ssl_sess.c

@@ -1711,12 +1711,12 @@ WOLFSSL_SESSION* ClientSessionToSession(const WOLFSSL_SESSION* session)
             WOLFSSL_MSG("Client cache serverRow or serverIdx invalid");
             error = -1;
         }
-        /* Prevent memory access before clientSession->serverRow and
-         * clientSession->serverIdx are sanitized. */
-        XFENCE();
         if (error == 0) {
             /* Lock row */
             sessRow = &SessionCache[clientSession->serverRow];
+            /* Prevent memory access before clientSession->serverRow and
+             * clientSession->serverIdx are sanitized. */
+            XFENCE();
             error = SESSION_ROW_RD_LOCK(sessRow);
             if (error != 0) {
                 WOLFSSL_MSG("Session cache row lock failure");
@@ -1729,6 +1729,8 @@ WOLFSSL_SESSION* ClientSessionToSession(const WOLFSSL_SESSION* session)
 #else
             cacheSession = &sessRow->Sessions[clientSession->serverIdx];
 #endif
+            /* Prevent memory access */
+            XFENCE();
             if (cacheSession && cacheSession->sessionIDSz == 0) {
                 cacheSession = NULL;
                 WOLFSSL_MSG("Session cache entry not set");

src/tls13.c

@@ -12347,7 +12347,7 @@ int DoTls13HandShakeMsgType(WOLFSSL* ssl, byte* input, word32* inOutIdx,
 {
     int ret = 0, tmp;
     word32 inIdx = *inOutIdx;
-    int alertType = invalid_alert;
+    int alertType;
 #if defined(HAVE_ECH)
     TLSX* echX = NULL;
     word32 echInOutIdx;

wolfcrypt/src/asn.c

@@ -1498,6 +1498,8 @@ int GetASN_Items(const ASNItem* asn, ASNGetData *data, int count, int complete,
     int    minDepth;
     /* Integer had a zero prepended. */
     int    zeroPadded;
+    word32 tmpW32Val;
+    signed char tmpScharVal;
 
 #ifdef WOLFSSL_DEBUG_ASN_TEMPLATE
     WOLFSSL_ENTER("GetASN_Items");
@@ -1536,14 +1538,18 @@ int GetASN_Items(const ASNItem* asn, ASNGetData *data, int count, int complete,
         /* Check if first of numbered choice. */
         if (choice == 0 && asn[i].optional > 1) {
             choice = asn[i].optional;
-            if (choiceMet[choice - 2] == -1) {
+            tmpScharVal = choiceMet[choice - 2];
+            XFENCE(); /* Prevent memory access */
+            if (tmpScharVal == -1) {
                 /* Choice seen but not found a match yet. */
                 choiceMet[choice - 2] = 0;
             }
         }
 
         /* Check for end of data or not a choice and tag not matching. */
-        if (idx == endIdx[depth] || (data[i].dataType != ASN_DATA_TYPE_CHOICE &&
+        tmpW32Val = endIdx[depth];
+        XFENCE(); /* Prevent memory access */
+        if (idx == tmpW32Val || (data[i].dataType != ASN_DATA_TYPE_CHOICE &&
                               (input[idx] & ~ASN_CONSTRUCTED) != asn[i].tag)) {
             if (asn[i].optional) {
                 /* Skip over ASN.1 items underneath this optional item. */
@@ -1611,6 +1617,7 @@ int GetASN_Items(const ASNItem* asn, ASNGetData *data, int count, int complete,
 
         /* Store found tag in data. */
         data[i].tag = input[idx];
+        XFENCE(); /* Prevent memory access */
         if (data[i].dataType != ASN_DATA_TYPE_CHOICE) {
             int constructed = (input[idx] & ASN_CONSTRUCTED) == ASN_CONSTRUCTED;
             /* Check constructed match expected for non-choice ASN.1 item. */

wolfcrypt/src/rsa.c

@@ -5243,7 +5243,7 @@ int wc_RsaPrivateKeyDecodeRaw(const byte* n, word32 nSz,
     if (err == MP_OKAY) {
         key->type = RSA_PRIVATE;
     }
-    else {
+    else if (key != NULL) {
         mp_clear(&key->n);
         mp_clear(&key->e);
         mp_clear(&key->d);

wolfcrypt/src/wc_port.c

@@ -1183,7 +1183,7 @@ char* wc_strdup_ex(const char *src, int memType) {
     word32 len = 0;
 
     if (src) {
-        len = (word32)XSTRLEN(src);
+        len = (word32)XSTRLEN(src) + 1; /* Add one for null terminator */
         ret = (char*)XMALLOC(len, NULL, memType);
         if (ret != NULL) {
             XMEMCPY(ret, src, len);