diff --git a/level_zero/sysman/source/shared/windows/pmt/sysman_pmt.cpp b/level_zero/sysman/source/shared/windows/pmt/sysman_pmt.cpp
index 17a96ec519..53caf2f649 100644
--- a/level_zero/sysman/source/shared/windows/pmt/sysman_pmt.cpp
+++ b/level_zero/sysman/source/shared/windows/pmt/sysman_pmt.cpp
@@ -75,13 +75,16 @@ ze_result_t PlatformMonitoringTech::readValue(const std::string &key, uint64_t &
 }
 
 ze_result_t PlatformMonitoringTech::getGuid() {
+    // arbitrary upper-bound, tune if needed
+    constexpr size_t sizeNeededMax = sizeof(PmtSysman::PmtTelemetryDiscovery) + (2 * PmtSysman::PmtMaxInterfaces - 1) * sizeof(PmtSysman::PmtTelemetryEntry);
+
     ze_result_t status;
     unsigned long sizeNeeded;
     PmtSysman::PmtTelemetryDiscovery *telemetryDiscovery = nullptr;
 
     // Get Telmetry Discovery size
     status = ioctlReadWriteData(deviceInterface, PmtSysman::IoctlPmtGetTelemetryDiscoverySize, NULL, 0, (void *)&sizeNeeded, sizeof(sizeNeeded), NULL);
-    if (status != ZE_RESULT_SUCCESS || sizeNeeded == 0) {
+    if (status != ZE_RESULT_SUCCESS || sizeNeeded == 0 || sizeNeeded > sizeNeededMax) {
         NEO::printDebugString(NEO::debugManager.flags.PrintDebugMessages.get(), stderr,
                               "Ioctl call could not return a valid value for the PMT interface telemetry size needed\n");
         DEBUG_BREAK_IF(true);
@@ -98,14 +101,15 @@ ze_result_t PlatformMonitoringTech::getGuid() {
     if (status != ZE_RESULT_SUCCESS) {
         NEO::printDebugString(NEO::debugManager.flags.PrintDebugMessages.get(), stderr,
                               "Ioctl call could not return a valid value for the PMT telemetry structure which provides the guids supported.\n");
-        DEBUG_BREAK_IF(true);
         heapFreeFunction(GetProcessHeap(), 0, telemetryDiscovery);
+        DEBUG_BREAK_IF(true);
         return ZE_RESULT_ERROR_UNKNOWN;
     }
 
     auto maxEntriesCount = (sizeNeeded - offsetof(PmtSysman::PmtTelemetryDiscovery, telemetry)) / sizeof(PmtSysman::PmtTelemetryEntry);
     if (telemetryDiscovery->count > maxEntriesCount) {
         NEO::printDebugString(NEO::debugManager.flags.PrintDebugMessages.get(), stderr, "Incorrect telemetry entries count.\n");
+        heapFreeFunction(GetProcessHeap(), 0, telemetryDiscovery);
         DEBUG_BREAK_IF(true);
         return ZE_RESULT_ERROR_UNKNOWN;
     }
@@ -116,8 +120,8 @@ ze_result_t PlatformMonitoringTech::getGuid() {
         } else {
             NEO::printDebugString(NEO::debugManager.flags.PrintDebugMessages.get(), stderr,
                                   "Telemetry index is out of range.\n");
-            DEBUG_BREAK_IF(true);
             heapFreeFunction(GetProcessHeap(), 0, telemetryDiscovery);
+            DEBUG_BREAK_IF(true);
             return ZE_RESULT_ERROR_UNKNOWN;
         }
     }