diff --git a/srcs/opendhcp183/query.cpp b/srcs/opendhcp183/query.cpp
index f75ecac..b95c5a3 100644
--- a/srcs/opendhcp183/query.cpp
+++ b/srcs/opendhcp183/query.cpp
@@ -92,6 +92,7 @@ static int dhcp_get_user_info(const char **pRsp, const char *pRequest) {
     if (pStrContent == nullptr) {
         sprintf(logBuff, "Request Json error %s", pRequest);
         logDHCPMess(logBuff, 1);
+        free((void *)pStrContent);
         return ERR_PROTO_DECODE;
     }
 
@@ -106,6 +107,7 @@ static int dhcp_get_user_info(const char **pRsp, const char *pRequest) {
         pSchJson = proto_msg_validation(pStrContent, i.pSchJson, i.pErrMsg);
         if (pSchJson != nullptr && strlen(pSchJson) > 0) {
             *pRsp = pSchJson;
+            free((void *)pStrContent);
             return ERR_SUCCESS;
         }
     }
@@ -380,6 +382,7 @@ static int add_dhcpd_rangeset(const char **pRsp, const char *pRequest) {
     if (pStrContent == nullptr) {
         sprintf(logBuff, "Request Json error %s", pRequest);
         logDHCPMess(logBuff, 1);
+        free((void *)pStrContent);
         return ERR_PROTO_DECODE;
     }
 
@@ -394,6 +397,7 @@ static int add_dhcpd_rangeset(const char **pRsp, const char *pRequest) {
         pSchJson = proto_msg_validation(pStrContent, i.pSchJson, i.pErrMsg);
         if (pSchJson != nullptr && strlen(pSchJson) > 0) {
             *pRsp = pSchJson;
+            free((void *)pStrContent);
             return ERR_SUCCESS;
         }
     }
@@ -496,6 +500,7 @@ static int delete_dhcpd_rangeset(const char **pRsp, const char *pRequest) {
     if (pStrContent == nullptr) {
         sprintf(logBuff, "Request Json error %s", pRequest);
         logDHCPMess(logBuff, 1);
+        free((void*)pStrContent);
         return ERR_PROTO_DECODE;
     }
 
@@ -510,6 +515,7 @@ static int delete_dhcpd_rangeset(const char **pRsp, const char *pRequest) {
         pSchJson = proto_msg_validation(pStrContent, i.pSchJson, i.pErrMsg);
         if (pSchJson != nullptr && strlen(pSchJson) > 0) {
             *pRsp = pSchJson;
+            free((void*)pStrContent);
             return ERR_SUCCESS;
         }
     }
diff --git a/unit_test/crypto/crypto_test.cpp b/unit_test/crypto/crypto_test.cpp
index 6455b18..afbfae1 100644
--- a/unit_test/crypto/crypto_test.cpp
+++ b/unit_test/crypto/crypto_test.cpp
@@ -21,6 +21,9 @@ TEST_SUITE("Crypto functions") {
         for(int i = 0; i<outputSize; i++) {
             CHECK_EQ(decode[i], pSrc[i]);
         }
+
+        free((void *)encode);
+        free((void *)decode);
     }
 
     TEST_CASE("AES") {
@@ -37,5 +40,8 @@ TEST_SUITE("Crypto functions") {
         symmetric_decrypto(algoType, out, outputSize, &res, &resSize, key);
         CHECK_NE(res, nullptr);
         REQUIRE_MESSAGE((strlen(data) == resSize), "the decrypted message:", res);
+
+        free((void *)out);
+        free((void *)res);
     }
 }
diff --git a/unit_test/s2j/s2j_test.cpp b/unit_test/s2j/s2j_test.cpp
index 2e8cc5e..3521f0b 100644
--- a/unit_test/s2j/s2j_test.cpp
+++ b/unit_test/s2j/s2j_test.cpp
@@ -37,6 +37,8 @@ TEST_SUITE("S2J_TEST") {
         for(i = 0; i < strlen(origin_Server.msg.info); i++) {
             CHECK_EQ(origin_Server.msg.info[i], testServer->child->next->next->child->valuestring[i]);
         }
+
+        cJSON_Delete(testServer);
     }
 
     TEST_CASE("J2S") {
@@ -50,5 +52,7 @@ TEST_SUITE("S2J_TEST") {
         s2j_struct_get_basic_element(pMsg, testInfo, string, info);
 
         CHECK_EQ(pServer->id, 3);
+        cJSON_Delete(testServer);
+        free(pServer);
     }
 }