diff --git a/source/libs/index/src/indexCache.c b/source/libs/index/src/indexCache.c
index a3f4f72093..a89cc47925 100644
--- a/source/libs/index/src/indexCache.c
+++ b/source/libs/index/src/indexCache.c
@@ -162,7 +162,6 @@ static int32_t cacheSearchCompareFunc(void* cache, SIndexTerm* term, SIdxTRslt*
     if (cond == MATCH) {
       if (c->operaType == ADD_VALUE) {
         INDEX_MERGE_ADD_DEL(tr->del, tr->add, c->uid)
-        // taosArrayPush(result, &c->uid);
         *s = kTypeValue;
       } else if (c->operaType == DEL_VALUE) {
         INDEX_MERGE_ADD_DEL(tr->add, tr->del, c->uid)
@@ -818,7 +817,13 @@ static bool idxCacheIteratorNext(Iterate* itera) {
     iv->type = ct->operaType;
     iv->ver = ct->version;
     iv->colVal = taosStrdup(ct->colVal);
-    (void)taosArrayPush(iv->val, &ct->uid);
+    if (iv->colVal == NULL) {
+      return false;
+    }
+    if (taosArrayPush(iv->val, &ct->uid) == NULL) {
+      taosMemoryFree(iv->colVal);
+      return false;
+    }
   }
   return next;
 }
diff --git a/source/libs/index/src/indexFst.c b/source/libs/index/src/indexFst.c
index e57ba6267d..fb9939e8a6 100644
--- a/source/libs/index/src/indexFst.c
+++ b/source/libs/index/src/indexFst.c
@@ -1029,7 +1029,12 @@ bool fstGet(Fst* fst, FstSlice* b, Output* out) {
   uint8_t* data = fstSliceData(b, &len);
 
   SArray* nodes = (SArray*)taosArrayInit(len, sizeof(FstNode*));
-  (void)taosArrayPush(nodes, &root);
+  if (nodes == NULL) {
+    return false;
+  }
+  if (taosArrayPush(nodes, &root) == NULL) {
+    goto _return;
+  }
   for (uint32_t i = 0; i < len; i++) {
     uint8_t inp = data[i];
     Output  res = 0;
@@ -1041,7 +1046,9 @@ bool fstGet(Fst* fst, FstSlice* b, Output* out) {
     (void)fstNodeGetTransitionAt(root, res, &trn);
     tOut += trn.out;
     root = fstGetNode(fst, trn.addr);
-    (void)taosArrayPush(nodes, &root);
+    if (taosArrayPush(nodes, &root) == NULL) {
+      goto _return;
+    }
   }
   if (!FST_NODE_IS_FINAL(root)) {
     goto _return;
@@ -1188,7 +1195,9 @@ bool stmStSeekMin(FStmSt* sws, FstBoundWithData* min) {
                         .trans = 0,
                         .out = {.null = false, .out = 0},
                         .autState = automFuncs[aut->type].start(aut)};  // auto.start callback
-    (void)taosArrayPush(sws->stack, &s);
+    if (taosArrayPush(sws->stack, &s) == NULL) {
+      return false;
+    }
     return true;
   }
   FstSlice* key = NULL;
diff --git a/source/libs/index/src/indexFstDfa.c b/source/libs/index/src/indexFstDfa.c
index f552d5feba..c95847525f 100644
--- a/source/libs/index/src/indexFstDfa.c
+++ b/source/libs/index/src/indexFstDfa.c
@@ -14,6 +14,7 @@
  */
 
 #include "indexFstDfa.h"
+#include "indexInt.h"
 #include "thash.h"
 
 const static uint32_t STATE_LIMIT = 1000;
@@ -68,23 +69,41 @@ FstDfa *dfaBuilderBuild(FstDfaBuilder *builder) {
   uint32_t      sz = taosArrayGetSize(builder->dfa->insts);
   FstSparseSet *cur = sparSetCreate(sz);
   FstSparseSet *nxt = sparSetCreate(sz);
+  if (cur == NULL || nxt == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return NULL;
+  }
 
   dfaAdd(builder->dfa, cur, 0);
 
   uint32_t result;
   SArray  *states = taosArrayInit(0, sizeof(uint32_t));
+  if (states == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return NULL;
+  }
   if (dfaBuilderCacheState(builder, cur, &result)) {
-    (void)taosArrayPush(states, &result);
+    if (taosArrayPush(states, &result) == NULL) {
+      goto _exception;
+    }
   }
   SHashObj *seen = taosHashInit(12, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), false, HASH_NO_LOCK);
+  if (seen == NULL) {
+    goto _exception;
+  }
+
   while (taosArrayGetSize(states) != 0) {
     result = *(uint32_t *)taosArrayPop(states);
     for (int i = 0; i < 256; i++) {
       uint32_t ns, dummpy = 0;
       if (dfaBuilderRunState(builder, cur, nxt, result, i, &ns)) {
         if (taosHashGet(seen, &ns, sizeof(ns)) == NULL) {
-          (void)taosHashPut(seen, &ns, sizeof(ns), &dummpy, sizeof(dummpy));
-          (void)taosArrayPush(states, &ns);
+          if (taosHashPut(seen, &ns, sizeof(ns), &dummpy, sizeof(dummpy)) != 0) {
+            goto _exception;
+          }
+          if (taosArrayPush(states, &ns) == NULL) {
+            goto _exception;
+          }
         }
       }
       if (taosArrayGetSize(builder->dfa->states) > STATE_LIMIT) {
@@ -96,6 +115,11 @@ FstDfa *dfaBuilderBuild(FstDfaBuilder *builder) {
   taosArrayDestroy(states);
   taosHashCleanup(seen);
   return builder->dfa;
+_exception:
+  taosArrayDestroy(states);
+  taosHashCleanup(seen);
+  indexError("failed to build dfa since %s", tstrerror(terrno));
+  return NULL;
 }
 
 bool dfaBuilderRunState(FstDfaBuilder *builder, FstSparseSet *cur, FstSparseSet *next, uint32_t state, uint8_t byte,
@@ -122,8 +146,13 @@ bool dfaBuilderRunState(FstDfaBuilder *builder, FstSparseSet *cur, FstSparseSet
 }
 
 bool dfaBuilderCacheState(FstDfaBuilder *builder, FstSparseSet *set, uint32_t *result) {
+  int32_t code = 0;
   SArray *tinsts = taosArrayInit(4, sizeof(uint32_t));
-  bool    isMatch = false;
+  if (tinsts == NULL) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+    goto _exception;
+  }
+  bool isMatch = false;
 
   for (int i = 0; i < sparSetLen(set); i++) {
     int32_t ip;
@@ -133,10 +162,16 @@ bool dfaBuilderCacheState(FstDfaBuilder *builder, FstSparseSet *set, uint32_t *r
     if (inst->ty == JUMP || inst->ty == SPLIT) {
       continue;
     } else if (inst->ty == RANGE) {
-      (void)taosArrayPush(tinsts, &ip);
+      if (taosArrayPush(tinsts, &ip) == NULL) {
+        code = TSDB_CODE_OUT_OF_MEMORY;
+        goto _exception;
+      }
     } else if (inst->ty == MATCH) {
       isMatch = true;
-      (void)taosArrayPush(tinsts, &ip);
+      if (taosArrayPush(tinsts, &ip) == NULL) {
+        code = TSDB_CODE_OUT_OF_MEMORY;
+        goto _exception;
+      }
     }
   }
   if (taosArrayGetSize(tinsts) == 0) {
@@ -149,13 +184,23 @@ bool dfaBuilderCacheState(FstDfaBuilder *builder, FstSparseSet *set, uint32_t *r
     taosArrayDestroy(tinsts);
   } else {
     DfaState st = {.insts = tinsts, .isMatch = isMatch};
-    (void)taosArrayPush(builder->dfa->states, &st);
+    if (taosArrayPush(builder->dfa->states, &st) == NULL) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+      goto _exception;
+    }
 
     int32_t sz = taosArrayGetSize(builder->dfa->states) - 1;
-    (void)taosHashPut(builder->cache, &tinsts, sizeof(POINTER_BYTES), &sz, sizeof(sz));
+    if ((code = taosHashPut(builder->cache, &tinsts, sizeof(POINTER_BYTES), &sz, sizeof(sz))) != 0) {
+      goto _exception;
+    }
+
     *result = sz;
   }
   return true;
+_exception:
+  indexError("failed to create dfa state, code:%d", code);
+  taosArrayDestroy(tinsts);
+  return false;
 }
 
 FstDfa *dfaCreate(SArray *insts, SArray *states) {
diff --git a/source/libs/index/src/indexFstNode.c b/source/libs/index/src/indexFstNode.c
index b82bf3904c..c5a443b05e 100644
--- a/source/libs/index/src/indexFstNode.c
+++ b/source/libs/index/src/indexFstNode.c
@@ -62,37 +62,6 @@ bool fstBuilderNodeEqual(FstBuilderNode* n1, FstBuilderNode* n2) {
   return true;
 }
 
-#if 0
-FstBuilderNode* fstBuilderNodeClone(FstBuilderNode* src) {
-  FstBuilderNode* node = taosMemoryMalloc(sizeof(FstBuilderNode));
-  if (node == NULL) {
-    return NULL;
-  }
-
-  //
-  size_t  sz = taosArrayGetSize(src->trans);
-  SArray* trans = taosArrayInit(sz, sizeof(FstTransition));
-  if (trans == NULL) {
-    taosMemoryFree(node);
-    return NULL;
-  }
-
-  for (size_t i = 0; i < sz; i++) {
-    FstTransition* tran = taosArrayGet(src->trans, i);
-    if (taosArrayPush(trans, tran) != NULL) {
-      taosArrayDestroy(trans);
-      taosMemoryFree(node);
-      return NULL;
-    }
-  }
-
-  node->trans = trans;
-  node->isFinal = src->isFinal;
-  node->finalOutput = src->finalOutput;
-  return node;
-}
-#endif
-
 // not destroy src, User's bussiness
 int32_t fstBuilderNodeCloneFrom(FstBuilderNode* dst, FstBuilderNode* src) {
   if (dst == NULL || src == NULL) {
diff --git a/source/libs/index/src/indexFstRegex.c b/source/libs/index/src/indexFstRegex.c
index c6ceb1d965..941cb82e90 100644
--- a/source/libs/index/src/indexFstRegex.c
+++ b/source/libs/index/src/indexFstRegex.c
@@ -39,7 +39,12 @@ FstRegex *regexCreate(const char *str) {
 
   for (int i = 0; i < strlen(str); i++) {
     uint8_t v = str[i];
-    (void)taosArrayPush(insts, &v);
+    if (taosArrayPush(insts, &v) == NULL) {
+      taosArrayDestroy(insts);
+      taosMemoryFree(regex->orig);
+      taosMemoryFree(regex);
+      return NULL;
+    }
   }
   FstDfaBuilder *builder = dfaBuilderCreate(insts);
   regex->dfa = dfaBuilderBuild(builder);
diff --git a/source/libs/index/src/indexFstRegister.c b/source/libs/index/src/indexFstRegister.c
index 060d441264..cc069c5d0f 100644
--- a/source/libs/index/src/indexFstRegister.c
+++ b/source/libs/index/src/indexFstRegister.c
@@ -84,7 +84,10 @@ FstRegistry* fstRegistryCreate(uint64_t tableSize, uint64_t mruSize) {
 
   for (uint64_t i = 0; i < nCells; i++) {
     FstRegistryCell cell = {.addr = NONE_ADDRESS, .node = fstBuilderNodeDefault()};
-    (void)taosArrayPush(tb, &cell);
+    if (taosArrayPush(tb, &cell) == NULL) {
+      fstRegistryDestroy(registry);
+      return NULL;
+    }
   }
 
   registry->table = tb;