Adds small validation for free (freeing out of upper bound) and adds task to readme.md

README.md

@@ -13,7 +13,7 @@ Also it leaks memory. A lot of memory.
 - Adding support for Modules
 - Adding support for Pointer Types
 - Adding support for String Type
-- Implement custom malloc that does what it should
+- Changing malloc magic number to hash value for complete validation.
 
 ## Guidlines
 - Calls to `die` or `die_extra` should follow the following scheme: `ContextName.ErrorName`

scripts/main.ts

@@ -3,7 +3,7 @@ VAR global : INT;
 PUB main() | i : INT
 BEGIN
 	0 -> i;
-	WHILE ((i + 1) -> i) <= 50 DO
+	WHILE ((i + 1) -> i) <= 25 DO
 	BEGIN
 		print2Int(50 - i, i);
 		sleep(2);

src/malloc.c

@@ -202,6 +202,9 @@ void free(void *ptr)
 	if((uintptr_t)ptr < (uintptr_t)malloc_heap_start) {
 		die_extra("free.InvalidFree", itoa((int)ptr, nullptr, 16));
 	}
+	if((uintptr_t)ptr >= (uintptr_t)malloc_heap_end) {
+		die_extra("free.InvalidFree", itoa((int)ptr, nullptr, 16));
+	}
 	freeCount++;
 
 	List *entry = (List*)((char*)ptr - sizeof(List));