Fix bugs found in crl.c, keys.c, and ssl_certman.c review

crl.c:
- wolfSSL_X509_CRL_dup: add NULL check on input before dereferencing crl->cm
- DupX509_CRL: distinguish empty source CRL list from allocation failure so
  duplicating a CRL with no entries no longer returns MEMORY_E
- wolfSSL_X509_STORE_add_crl: free newly-allocated CRL when wc_LockRwLock_Rd
  fails to avoid leaking it
- InitCRL: propagate wolfSSL_RefInit failure in OPENSSL_ALL +
  WOLFSSL_REFCNT_ERROR_RETURN builds, freeing crlLock (and cond when
  HAVE_CRL_MONITOR is enabled) on the error path

keys.c:
- GetCipherSpec: remove duplicate usingPSK_cipher assignment in
  BUILD_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256 case
- GetCipherSpec: return UNSUPPORTED_SUITE for unknown cipher suite bytes in
  the TLS13_BYTE, ECDHE_PSK_BYTE, and SM_BYTE switch blocks, matching the
  behavior of the ECC_BYTE, CHACHA_BYTE, and normal suite switches
- SetKeys: fix misleading indentation on the AESCCM and SM4-CCM dec->aes
  NULL-check return statements

ssl_certman.c:
- AddTrustedPeer: remove dead code that checked peerCert->permittedNames
  and peerCert->excludedNames immediately after XMEMSET zeroed the struct
- AddTrustedPeer: use cm->heap (matching allocation) instead of NULL when
  freeing cert on the ParseCert failure path
- Extract the body of wolfSSL_CertManagerFree into a new static helper
  DoCertManagerFree that unconditionally disposes of the certificate
  manager, bypassing the reference count check. wolfSSL_CertManagerFree
  now delegates to it after the RefDec check.
- wolfSSL_CertManagerNew_ex: on init failure, call DoCertManagerFree
  directly to avoid leaking cm when the reference count was never
  initialized or failed to initialize. Set cm->heap immediately after
  XMEMSET so the forceful free path can use it.

Author: julek-wolfssl

src/crl.c

@@ -91,9 +91,20 @@ int InitCRL(WOLFSSL_CRL* crl, WOLFSSL_CERT_MANAGER* cm)
     }
 #ifdef OPENSSL_ALL
     {
-        int ret;
-        wolfSSL_RefInit(&crl->ref, &ret);
-        (void)ret;
+        int refErr;
+        wolfSSL_RefInit(&crl->ref, &refErr);
+    #ifdef WOLFSSL_REFCNT_ERROR_RETURN
+        if (refErr != 0) {
+            WOLFSSL_MSG("wolfSSL_RefInit failed");
+            wc_FreeRwLock(&crl->crlLock);
+        #ifdef HAVE_CRL_MONITOR
+            wolfSSL_CondFree(&crl->cond);
+        #endif
+            return refErr;
+        }
+    #else
+        (void)refErr;
+    #endif
     }
 #endif
 #if defined(OPENSSL_EXTRA)
@@ -1451,7 +1462,7 @@ static int DupX509_CRL(WOLFSSL_X509_CRL *dupl, const WOLFSSL_X509_CRL* crl)
 #endif
 
     dupl->crlList = DupCRL_list(crl->crlList, dupl->heap);
-    if (dupl->crlList == NULL)
+    if (crl->crlList != NULL && dupl->crlList == NULL)
         return MEMORY_E;
 #ifdef HAVE_CRL_IO
     dupl->crlIOCb = crl->crlIOCb;
@@ -1466,6 +1477,9 @@ WOLFSSL_X509_CRL* wolfSSL_X509_CRL_dup(const WOLFSSL_X509_CRL* crl)
 
     WOLFSSL_ENTER("wolfSSL_X509_CRL_dup");
 
+    if (crl == NULL)
+        return NULL;
+
     ret = wolfSSL_X509_crl_new(crl->cm);
     if (ret != NULL && DupX509_CRL(ret, crl) != 0) {
         FreeCRL(ret, 1);
@@ -1514,6 +1528,7 @@ int wolfSSL_X509_STORE_add_crl(WOLFSSL_X509_STORE *store, WOLFSSL_X509_CRL *newc
         }
         if (wc_LockRwLock_Rd(&newcrl->crlLock) != 0) {
             WOLFSSL_MSG("wc_LockRwLock_Rd failed");
+            FreeCRL(crl, 1);
             return BAD_MUTEX_E;
         }
         ret = DupX509_CRL(crl, newcrl);

src/keys.c

@@ -525,8 +525,6 @@ int GetCipherSpec(word16 side, byte cipherSuite0, byte cipherSuite,
         specs->block_size            = WC_AES_BLOCK_SIZE;
         specs->iv_size               = AES_IV_SIZE;
 
-        if (opts != NULL)
-            opts->usingPSK_cipher    = 1;
         if (opts != NULL)
             opts->usingPSK_cipher    = 1;
         break;
@@ -1374,7 +1372,8 @@ int GetCipherSpec(word16 side, byte cipherSuite0, byte cipherSuite,
     #endif
 #endif /* WOLFSSL_TLS13 */
         default:
-            break;
+            WOLFSSL_MSG("Unsupported cipher suite, SetCipherSpecs TLS 1.3");
+            return UNSUPPORTED_SUITE;
         }
     }
 
@@ -1405,7 +1404,8 @@ int GetCipherSpec(word16 side, byte cipherSuite0, byte cipherSuite,
 #endif
 
     default:
-        break;
+        WOLFSSL_MSG("Unsupported cipher suite, SetCipherSpecs ECDHE_PSK");
+        return UNSUPPORTED_SUITE;
     }
     }
 
@@ -1466,7 +1466,8 @@ int GetCipherSpec(word16 side, byte cipherSuite0, byte cipherSuite,
 #endif
 
     default:
-        break;
+        WOLFSSL_MSG("Unsupported cipher suite, SetCipherSpecs SM");
+        return UNSUPPORTED_SUITE;
     }
     }
 
@@ -2799,7 +2800,7 @@ int SetKeys(Ciphers* enc, Ciphers* dec, Keys* keys, CipherSpecs* specs,
             if (dec->aes == NULL) {
                 dec->aes = (Aes*)XMALLOC(sizeof(Aes), heap, DYNAMIC_TYPE_CIPHER);
                 if (dec->aes == NULL)
-                return MEMORY_E;
+                    return MEMORY_E;
             } else {
                 wc_AesFree(dec->aes);
             }
@@ -3247,7 +3248,7 @@ int SetKeys(Ciphers* enc, Ciphers* dec, Keys* keys, CipherSpecs* specs,
                 dec->sm4 = (wc_Sm4*)XMALLOC(sizeof(wc_Sm4), heap,
                                             DYNAMIC_TYPE_CIPHER);
                 if (dec->sm4 == NULL)
-                return MEMORY_E;
+                    return MEMORY_E;
             } else {
                 wc_Sm4Free(dec->sm4);
             }

src/ssl_certman.c

@@ -74,6 +74,8 @@ static WC_INLINE WOLFSSL_METHOD* cm_pick_method(void* heap)
     #endif
 }
 
+static void DoCertManagerFree(WOLFSSL_CERT_MANAGER* cm);
+
 /* Create a new certificate manager with a heap hint.
  *
  * @param [in] heap  Heap hint.
@@ -107,6 +109,8 @@ WOLFSSL_CERT_MANAGER* wolfSSL_CertManagerNew_ex(void* heap)
     if (!err) {
         /* Reset all fields. */
         XMEMSET(cm, 0, sizeof(WOLFSSL_CERT_MANAGER));
+        /* Set heap hint early so cleanup can use it. */
+        cm->heap = heap;
 
         /* Create a mutex for use when modify table of stored CAs. */
         if (wc_InitMutex(&cm->caLock) != 0) {
@@ -144,14 +148,12 @@ WOLFSSL_CERT_MANAGER* wolfSSL_CertManagerNew_ex(void* heap)
     #ifdef HAVE_DILITHIUM
         cm->minDilithiumKeySz = MIN_DILITHIUMKEY_SZ;
     #endif /* HAVE_DILITHIUM */
-
-        /* Set heap hint to use in certificate manager operations. */
-        cm->heap = heap;
     }
 
-    /* Dispose of certificate manager on error. */
+    /* Dispose of certificate manager on error. The reference count may not
+     * have been initialized, so bypass the ref check and free directly. */
     if (err && (cm != NULL)) {
-        wolfSSL_CertManagerFree(cm);
+        DoCertManagerFree(cm);
         cm = NULL;
     }
     return cm;
@@ -168,6 +170,57 @@ WOLFSSL_CERT_MANAGER* wolfSSL_CertManagerNew(void)
     return wolfSSL_CertManagerNew_ex(NULL);
 }
 
+/* Unconditionally dispose of all resources owned by the certificate manager
+ * and free cm itself, bypassing any reference count check. Safe to call on
+ * a cm that has been XMEMSET but only partially initialized - NULL-pointer
+ * members are handled, and wc_FreeMutex / wolfSSL_RefFree on zeroed storage
+ * are benign on supported platforms.
+ *
+ * @param [in, out] cm  Certificate manager (must be non-NULL).
+ */
+static void DoCertManagerFree(WOLFSSL_CERT_MANAGER* cm)
+{
+#ifdef HAVE_CRL
+    /* Dispose of CRL handler. */
+    if (cm->crl != NULL) {
+        /* Dispose of CRL object - indicating dynamically allocated. */
+        FreeCRL(cm->crl, 1);
+    }
+#endif
+
+#ifdef HAVE_OCSP
+    /* Dispose of OCSP handler. */
+    if (cm->ocsp != NULL) {
+        FreeOCSP(cm->ocsp, 1);
+    }
+    /* Dispose of URL. */
+    XFREE(cm->ocspOverrideURL, cm->heap, DYNAMIC_TYPE_URL);
+#if !defined(NO_WOLFSSL_SERVER) && \
+    (defined(HAVE_CERTIFICATE_STATUS_REQUEST) || \
+     defined(HAVE_CERTIFICATE_STATUS_REQUEST_V2))
+    /* Dispose of OCSP stapling handler. */
+    if (cm->ocsp_stapling) {
+        FreeOCSP(cm->ocsp_stapling, 1);
+    }
+#endif
+#endif /* HAVE_OCSP */
+
+    /* Dispose of CA table and mutex. */
+    FreeSignerTable(cm->caTable, CA_TABLE_SIZE, cm->heap);
+    wc_FreeMutex(&cm->caLock);
+
+#ifdef WOLFSSL_TRUST_PEER_CERT
+    /* Dispose of trusted peer table and mutex. */
+    FreeTrustedPeerTable(cm->tpTable, TP_TABLE_SIZE, cm->heap);
+    wc_FreeMutex(&cm->tpLock);
+#endif
+
+    /* Dispose of reference count. */
+    wolfSSL_RefFree(&cm->ref);
+    /* Dispose of certificate manager memory. */
+    XFREE(cm, cm->heap, DYNAMIC_TYPE_CERT_MANAGER);
+}
+
 /* Dispose of certificate manager.
  *
  * @param [in, out] cm  Certificate manager.
@@ -191,45 +244,7 @@ void wolfSSL_CertManagerFree(WOLFSSL_CERT_MANAGER* cm)
         (void)ret;
     #endif
         if (doFree) {
-        #ifdef HAVE_CRL
-            /* Dispose of CRL handler. */
-            if (cm->crl != NULL) {
-                /* Dispose of CRL object - indicating dynamically allocated. */
-                FreeCRL(cm->crl, 1);
-            }
-        #endif
-
-    #ifdef HAVE_OCSP
-            /* Dispose of OCSP handler. */
-            if (cm->ocsp != NULL) {
-                FreeOCSP(cm->ocsp, 1);
-            }
-            /* Dispose of URL. */
-            XFREE(cm->ocspOverrideURL, cm->heap, DYNAMIC_TYPE_URL);
-        #if !defined(NO_WOLFSSL_SERVER) && \
-            (defined(HAVE_CERTIFICATE_STATUS_REQUEST) || \
-             defined(HAVE_CERTIFICATE_STATUS_REQUEST_V2))
-            /* Dispose of OCSP stapling handler. */
-            if (cm->ocsp_stapling) {
-                FreeOCSP(cm->ocsp_stapling, 1);
-            }
-        #endif
-    #endif /* HAVE_OCSP */
-
-            /* Dispose of CA table and mutex. */
-            FreeSignerTable(cm->caTable, CA_TABLE_SIZE, cm->heap);
-            wc_FreeMutex(&cm->caLock);
-
-        #ifdef WOLFSSL_TRUST_PEER_CERT
-            /* Dispose of trusted peer table and mutex. */
-            FreeTrustedPeerTable(cm->tpTable, TP_TABLE_SIZE, cm->heap);
-            wc_FreeMutex(&cm->tpLock);
-        #endif
-
-            /* Dispose of reference count. */
-            wolfSSL_RefFree(&cm->ref);
-            /* Dispose of certificate manager memory. */
-            XFREE(cm, cm->heap, DYNAMIC_TYPE_CERT_MANAGER);
+            DoCertManagerFree(cm);
         }
     }
 }
@@ -2859,7 +2874,7 @@ int AddTrustedPeer(WOLFSSL_CERT_MANAGER* cm, DerBuffer** pDer, int verify)
     InitDecodedCert(cert, der->buffer, der->length, cm->heap);
     if ((ret = ParseCert(cert, TRUSTED_PEER_TYPE, verify, cm)) != 0) {
         FreeDecodedCert(cert);
-        XFREE(cert, NULL, DYNAMIC_TYPE_DCERT);
+        XFREE(cert, cm->heap, DYNAMIC_TYPE_DCERT);
         FreeDer(&der);
         return ret;
     }
@@ -2875,13 +2890,6 @@ int AddTrustedPeer(WOLFSSL_CERT_MANAGER* cm, DerBuffer** pDer, int verify)
     }
     XMEMSET(peerCert, 0, sizeof(TrustedPeerCert));
 
-    #ifndef IGNORE_NAME_CONSTRAINTS
-        if (peerCert->permittedNames)
-            FreeNameSubtrees(peerCert->permittedNames, cm->heap);
-        if (peerCert->excludedNames)
-            FreeNameSubtrees(peerCert->excludedNames, cm->heap);
-    #endif
-
     if (AlreadyTrustedPeer(cm, cert)) {
         WOLFSSL_MSG("\tAlready have this CA, not adding again");
         FreeTrustedPeer(peerCert, cm->heap);