diff --git a/src/coreclr/minipal/Unix/doublemapping.cpp b/src/coreclr/minipal/Unix/doublemapping.cpp
index 57ce0c09f283df..cb65e5e284e2b3 100644
--- a/src/coreclr/minipal/Unix/doublemapping.cpp
+++ b/src/coreclr/minipal/Unix/doublemapping.cpp
@@ -198,7 +198,10 @@ bool VMToOSInterface::ReleaseDoubleMappedMemory(void *mapperHandle, void* pStart
 {
 #ifndef TARGET_OSX
     int fd = (int)(size_t)mapperHandle;
-    mmap(pStart, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, offset);
+    if (mmap(pStart, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, offset) == MAP_FAILED)
+    {
+        return false;
+    }
     memset(pStart, 0, size);
 #endif // TARGET_OSX
     return munmap(pStart, size) != -1;
@@ -208,7 +211,12 @@ void* VMToOSInterface::GetRWMapping(void *mapperHandle, void* pStart, size_t off
 {
 #ifndef TARGET_OSX
     int fd = (int)(size_t)mapperHandle;
-    return mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
+    void* result = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
+    if (result == MAP_FAILED)
+    {
+        result = NULL;
+    }
+    return result;
 #else // TARGET_OSX
 #ifdef TARGET_AMD64
     vm_address_t startRW;
diff --git a/src/coreclr/nativeaot/Runtime/unix/PalRedhawkUnix.cpp b/src/coreclr/nativeaot/Runtime/unix/PalRedhawkUnix.cpp
index e54ce9a015141f..e72c83a15b1dad 100644
--- a/src/coreclr/nativeaot/Runtime/unix/PalRedhawkUnix.cpp
+++ b/src/coreclr/nativeaot/Runtime/unix/PalRedhawkUnix.cpp
@@ -743,7 +743,7 @@ REDHAWK_PALEXPORT _Ret_maybenull_ _Post_writable_byte_size_(size) void* REDHAWK_
 
         void * pRetVal = mmap(pAddress, alignedSize, unixProtect, flags, -1, 0);
 
-        if (pRetVal != NULL)
+        if (pRetVal != MAP_FAILED)
         {
             void * pAlignedRetVal = (void *)(((size_t)pRetVal + (Alignment - 1)) & ~(Alignment - 1));
             size_t startPadding = (size_t)pAlignedRetVal - (size_t)pRetVal;
diff --git a/src/coreclr/utilcode/executableallocator.cpp b/src/coreclr/utilcode/executableallocator.cpp
index 7872954adc485c..078800995d1334 100644
--- a/src/coreclr/utilcode/executableallocator.cpp
+++ b/src/coreclr/utilcode/executableallocator.cpp
@@ -453,7 +453,10 @@ void ExecutableAllocator::Release(void* pRX)
 
         if (pBlock != NULL)
         {
-            VMToOSInterface::ReleaseDoubleMappedMemory(m_doubleMemoryMapperHandle, pRX, pBlock->offset, pBlock->size);
+            if (!VMToOSInterface::ReleaseDoubleMappedMemory(m_doubleMemoryMapperHandle, pRX, pBlock->offset, pBlock->size))
+            {
+                g_fatalErrorHandler(COR_E_EXECUTIONENGINE, W("Releasing the double mapped memory failed"));
+            }
             // Put the released block into the free block list
             pBlock->baseRX = NULL;
             pBlock->next = m_pFirstFreeBlockRX;