fix: resolve memory leak on exceptions in mndCreateTopic

source/dnode/mnode/impl/src/mndTopic.c

@@ -377,6 +377,10 @@ static int32_t extractTopicTbInfo(SNode *pAst, SMqTopicObj *pTopic) {
 static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *pCreate, SDbObj *pDb,
                               const char *userName) {
   mInfo("start to create topic:%s", pCreate->name);
+  STrans *pTrans = NULL;
+  int32_t code = -1;
+  SNode  *pAst = NULL;
+  SQueryPlan *pPlan = NULL;
 
   SMqTopicObj topicObj = {0};
   tstrncpy(topicObj.name, pCreate->name, TSDB_TOPIC_FNAME_LEN);
@@ -401,7 +405,7 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
     if (pCreate->withMeta) {
       terrno = TSDB_CODE_MND_INVALID_TOPIC_OPTION;
       mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
-      return -1;
+      goto _OUT;
     }
 
     topicObj.ast = taosStrdup(pCreate->ast);
@@ -409,32 +413,21 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
 
     qDebugL("topic:%s ast %s", topicObj.name, topicObj.ast);
 
-    SNode *pAst = NULL;
     if (nodesStringToNode(pCreate->ast, &pAst) != 0) {
-      taosMemoryFree(topicObj.ast);
-      taosMemoryFree(topicObj.sql);
       mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
-      return -1;
+      goto _OUT;
     }
 
-    SQueryPlan *pPlan = NULL;
-
     SPlanContext cxt = {.pAstRoot = pAst, .topicQuery = true};
     if (qCreateQueryPlan(&cxt, &pPlan, NULL) != 0) {
       mError("failed to create topic:%s since %s", pCreate->name, terrstr());
-      taosMemoryFree(topicObj.ast);
-      taosMemoryFree(topicObj.sql);
-      nodesDestroyNode(pAst);
-      return -1;
+      goto _OUT;
     }
 
     topicObj.ntbColIds = taosArrayInit(0, sizeof(int16_t));
     if (topicObj.ntbColIds == NULL) {
-      taosMemoryFree(topicObj.ast);
-      taosMemoryFree(topicObj.sql);
-      nodesDestroyNode(pAst);
       terrno = TSDB_CODE_OUT_OF_MEMORY;
-      return -1;
+      goto _OUT;
     }
 
     extractTopicTbInfo(pAst, &topicObj);
@@ -446,25 +439,18 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
 
     if (qExtractResultSchema(pAst, &topicObj.schema.nCols, &topicObj.schema.pSchema) != 0) {
       mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
-      taosMemoryFree(topicObj.ast);
-      taosMemoryFree(topicObj.sql);
-      nodesDestroyNode(pAst);
-      return -1;
+      goto _OUT;
     }
 
     if (nodesNodeToString((SNode *)pPlan, false, &topicObj.physicalPlan, NULL) != 0) {
       mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
-      taosMemoryFree(topicObj.ast);
-      taosMemoryFree(topicObj.sql);
-      return -1;
+      goto _OUT;
     }
-    nodesDestroyNode(pAst);
-    nodesDestroyNode((SNode *)pPlan);
   } else if (pCreate->subType == TOPIC_SUB_TYPE__TABLE) {
     SStbObj *pStb = mndAcquireStb(pMnode, pCreate->subStbName);
     if (pStb == NULL) {
       terrno = TSDB_CODE_MND_STB_NOT_EXIST;
-      return -1;
+      goto _OUT;
     }
 
     strcpy(topicObj.stbName, pCreate->subStbName);
@@ -483,13 +469,10 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
   /*topicObj.withTbName = 1;*/
   /*topicObj.withSchema = 1;*/
 
-  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_DB_INSIDE, pReq, "create-topic");
+  pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_DB_INSIDE, pReq, "create-topic");
   if (pTrans == NULL) {
     mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
-    taosMemoryFreeClear(topicObj.ast);
-    taosMemoryFreeClear(topicObj.sql);
-    taosMemoryFreeClear(topicObj.physicalPlan);
-    return -1;
+    goto _OUT;
   }
 
   mndTransSetDbName(pTrans, pDb->name, NULL);
@@ -499,9 +482,7 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
   SSdbRaw *pCommitRaw = mndTopicActionEncode(&topicObj);
   if (pCommitRaw == NULL || mndTransAppendCommitlog(pTrans, pCommitRaw) != 0) {
     mError("trans:%d, failed to append commit log since %s", pTrans->id, terrstr());
-    taosMemoryFreeClear(topicObj.physicalPlan);
-    mndTransDrop(pTrans);
-    return -1;
+    goto _OUT;
   }
 
   (void)sdbSetRawStatus(pCommitRaw, SDB_STATUS_READY);
@@ -530,17 +511,16 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
       tEncodeSize(tEncodeSTqCheckInfo, &info, len, code);
       if (code < 0) {
         sdbRelease(pSdb, pVgroup);
-        mndTransDrop(pTrans);
-        return -1;
+        goto _OUT;
       }
       void    *buf = taosMemoryCalloc(1, sizeof(SMsgHead) + len);
       void    *abuf = POINTER_SHIFT(buf, sizeof(SMsgHead));
       SEncoder encoder;
       tEncoderInit(&encoder, abuf, len);
       if (tEncodeSTqCheckInfo(&encoder, &info) < 0) {
+        taosMemoryFree(buf);
         sdbRelease(pSdb, pVgroup);
-        mndTransDrop(pTrans);
-        return -1;
+        goto _OUT;
       }
       tEncoderClear(&encoder);
       ((SMsgHead *)buf)->vgId = htonl(pVgroup->vgId);
@@ -553,32 +533,32 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
       if (mndTransAppendRedoAction(pTrans, &action) != 0) {
         taosMemoryFree(buf);
         sdbRelease(pSdb, pVgroup);
-        mndTransDrop(pTrans);
-        return -1;
+        goto _OUT;
       }
-
+      buf = NULL;
       sdbRelease(pSdb, pVgroup);
     }
   }
 
   if (mndTransPrepare(pMnode, pTrans) != 0) {
     mError("trans:%d, failed to prepare since %s", pTrans->id, terrstr());
-    taosMemoryFreeClear(topicObj.physicalPlan);
-    mndTransDrop(pTrans);
-    return -1;
+    goto _OUT;
   }
 
+  code = TSDB_CODE_ACTION_IN_PROGRESS;
+
+_OUT:
   taosMemoryFreeClear(topicObj.physicalPlan);
   taosMemoryFreeClear(topicObj.sql);
   taosMemoryFreeClear(topicObj.ast);
   taosArrayDestroy(topicObj.ntbColIds);
-
   if (topicObj.schema.nCols) {
     taosMemoryFreeClear(topicObj.schema.pSchema);
   }
-
+  nodesDestroyNode(pAst);
+  nodesDestroyNode((SNode *)pPlan);
   mndTransDrop(pTrans);
-  return TSDB_CODE_ACTION_IN_PROGRESS;
+  return code;
 }
 
 static int32_t mndProcessCreateTopicReq(SRpcMsg *pReq) {