Merge pull request #17383 from taosdata/fix/hzcheng_coverity_scan

fix: coverity scan problem

source/dnode/vnode/src/meta/metaTable.c

@@ -51,7 +51,7 @@ static int metaUpdateMetaRsp(tb_uid_t uid, char *tbName, SSchemaWrapper *pSchema
     return -1;
   }
 
-  strcpy(pMetaRsp->tbName, tbName);
+  strncpy(pMetaRsp->tbName, tbName, TSDB_TABLE_NAME_LEN);
   pMetaRsp->numOfColumns = pSchema->nCols;
   pMetaRsp->tableType = TSDB_NORMAL_TABLE;
   pMetaRsp->sversion = pSchema->version;
@@ -817,6 +817,11 @@ static int metaUpdateTableTagVal(SMeta *pMeta, int64_t version, SVAlterTbReq *pA
   const void *pData = NULL;
   int         nData = 0;
 
+  if (pAlterTbReq->tagName == NULL) {
+    terrno = TSDB_CODE_INVALID_MSG;
+    return -1;
+  }
+
   // search name index
   ret = tdbTbGet(pMeta->pNameIdx, pAlterTbReq->tbName, strlen(pAlterTbReq->tbName) + 1, &pVal, &nVal);
   if (ret < 0) {

source/dnode/vnode/src/tsdb/tsdbFS.c

@@ -819,7 +819,7 @@ int32_t tsdbFSCommit2(STsdb *pTsdb, STsdbFS *pFSNew) {
       nRef = atomic_sub_fetch_32(&fSet.pHeadF->nRef, 1);
       if (nRef == 0) {
         tsdbHeadFileName(pTsdb, pSetOld->diskId, pSetOld->fid, fSet.pHeadF, fname);
-        taosRemoveFile(fname);
+        (void)taosRemoveFile(fname);
         taosMemoryFree(fSet.pHeadF);
       }
     } else {

source/dnode/vnode/src/vnd/vnodeSvr.c

@@ -41,7 +41,10 @@ int32_t vnodePreProcessWriteMsg(SVnode *pVnode, SRpcMsg *pMsg) {
       int32_t nReqs;
 
       tDecoderInit(&dc, (uint8_t *)pMsg->pCont + sizeof(SMsgHead), pMsg->contLen - sizeof(SMsgHead));
-      tStartDecode(&dc);
+      if (tStartDecode(&dc) < 0) {
+        code = TSDB_CODE_INVALID_MSG;
+        return code;
+      }
 
       if (tDecodeI32v(&dc, &nReqs) < 0) {
         code = TSDB_CODE_INVALID_MSG;