add null pointer check

d198dcbb · dapan1121 · 63d68915 · d198dcbb
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src/client/src/tscPrepare.c src/client/src/tscPrepare.c +5 -0

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--- a/src/client/src/tscPrepare.c
+++ b/src/client/src/tscPrepare.c
@@ -879,6 +879,11 @@ int taos_stmt_prepare(TAOS_STMT* stmt, const char* sql, unsigned long length) {
    return TSDB_CODE_TSC_DISCONNECTED;
  }
+  if (sql == NULL) {
+    tscError("sql is NULL");
+    return TSDB_CODE_TSC_APP_ERROR;
+  }
  SSqlObj* pSql = pStmt->pSql;
  size_t   sqlLen = strlen(sql);