fix: invalid msg while alter db replica

source/dnode/mgmt/mgmt_vnode/src/vmHandle.c

@@ -273,7 +273,17 @@ int32_t vmProcessAlterVnodeReq(SVnodeMgmt *pMgmt, SRpcMsg *pMsg) {
   }
 
   int32_t vgId = alterReq.vgId;
-  dInfo("vgId:%d, start to alter vnode replica", alterReq.vgId);
+  dInfo("vgId:%d, start to alter vnode, replica:%d selfIndex:%d strict:%d", alterReq.vgId, alterReq.replica,
+        alterReq.selfIndex, alterReq.strict);
+  for (int32_t i = 0; i < alterReq.replica; ++i) {
+    dInfo("vgId:%d, replica:%d ep:%s:%u", alterReq.vgId, i, alterReq.replicas[i].fqdn, alterReq.replicas[i].port);
+  }
+
+  if (alterReq.replica <= 0 || alterReq.selfIndex < 0 || alterReq.selfIndex >= alterReq.replica) {
+    terrno = TSDB_CODE_INVALID_MSG;
+    dError("vgId:%d, failed to alter replica since invalid msg", alterReq.vgId);
+    return -1;
+  }
 
   SVnodeObj *pVnode = vmAcquireVnode(pMgmt, vgId);
   if (pVnode == NULL) {

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

@@ -341,6 +341,7 @@ static void *mndBuildAlterVnodeReplicaReq(SMnode *pMnode, SDbObj *pDb, SVgObj *p
       alterReq.selfIndex = v;
     }
   }
+  alterReq.replica = pVgroup->replica;
 
   if (alterReq.selfIndex == -1) {
     terrno = TSDB_CODE_MND_APP_ERROR;