fixing issues

1) main.c: order of init (multiboot.c must be after heap & paging
   because it uses heap to allocate pages for framebuffer)
2) paging.c: zeroing new pages allocated via heap
3) multiboot2.c: invalid pointer arithmetic
4) libk/string.c: check for null pointers in memcpy
5) paging: only page_lvl2 should have FLAG_HUGE
6) keyboard.c: kfree(print_buff)

3 files changed, 5 insertions, 1 deletions

diff --git a/kernel/src/libk/serial_stdio.c b/kernel/src/libk/serial_stdio.c
index a56750b..fb61ba1 100644
--- a/kernel/src/libk/serial_stdio.c
+++ b/kernel/src/libk/serial_stdio.c
@@ -50,7 +50,7 @@ void serial_printf(const char *s, ...)
 			else if(s[i] == 'x') serial_print_hex((uint64_t)va_arg(list, uint64_t));
 			else
 			{
-				serial_print_string("Wrong format using printf\n");
+				serial_print_string("Wrong format using serial_printf\n");
 				return;
 			}
 		}
diff --git a/kernel/src/libk/stdio.c b/kernel/src/libk/stdio.c
index c5c8643..e7e372d 100644
--- a/kernel/src/libk/stdio.c
+++ b/kernel/src/libk/stdio.c
@@ -1,5 +1,6 @@
 #include <types.h>
 #include <libk/stdio.h>
+#include <libk/serial_stdio.h>
 #include <stdarg.h>
 #include <libk/string.h>
 #include <graphics.h>
diff --git a/kernel/src/libk/string.c b/kernel/src/libk/string.c
index be37ba9..4cee538 100644
--- a/kernel/src/libk/string.c
+++ b/kernel/src/libk/string.c
@@ -70,6 +70,9 @@ void itoh(uint64_t num, char* s)
 
 void memcpy(const void* destptr, const void* srcptr, size_t n)
 {
+	if (destptr == NULL || srcptr == NULL)
+		return;
+
 	uint8_t* dest = (uint8_t*)destptr;
 	const uint8_t* src = (const uint8_t*)srcptr;