Merge pull request #2531 from jasonKercher/fix2530

add nil check to heap_alloc calls (issue 2530)

core/os/os.odin

@@ -194,7 +194,7 @@ heap_allocator_proc :: proc(allocator_data: rawptr, mode: mem.Allocator_Mode,
 		ptr := uintptr(aligned_mem)
 		aligned_ptr := (ptr - 1 + uintptr(a)) & -uintptr(a)
 		diff := int(aligned_ptr - ptr)
-		if (size + diff) > space {
+		if (size + diff) > space || allocated_mem == nil {
 			return nil, .Out_Of_Memory
 		}
 

core/os/os2/heap_linux.odin

@@ -166,7 +166,7 @@ _heap_allocator_proc :: proc(allocator_data: rawptr, mode: mem.Allocator_Mode,
 		ptr := uintptr(aligned_mem)
 		aligned_ptr := (ptr - 1 + uintptr(a)) & -uintptr(a)
 		diff := int(aligned_ptr - ptr)
-		if (size + diff) > space {
+		if (size + diff) > space || allocated_mem == nil {
 			return nil, .Out_Of_Memory
 		}
 

core/os/os2/heap_windows.odin

@@ -52,7 +52,7 @@ _heap_allocator_proc :: proc(allocator_data: rawptr, mode: mem.Allocator_Mode,
 		ptr := uintptr(aligned_mem)
 		aligned_ptr := (ptr - 1 + uintptr(a)) & -uintptr(a)
 		diff := int(aligned_ptr - ptr)
-		if (size + diff) > space {
+		if (size + diff) > space || allocated_mem == nil {
 			return nil, .Out_Of_Memory
 		}
 

core/runtime/os_specific_windows.odin

@@ -112,7 +112,7 @@ _windows_default_alloc_or_resize :: proc "contextless" (size, alignment: int, ol
 	ptr := uintptr(aligned_mem)
 	aligned_ptr := (ptr - 1 + uintptr(a)) & -uintptr(a)
 	diff := int(aligned_ptr - ptr)
-	if (size + diff) > space {
+	if (size + diff) > space || allocated_mem == nil {
 		return nil, .Out_Of_Memory
 	}