--- a/linux-2.6.24.6/drivers/char/mem.c
+++ b/linux-2.6.24.6/drivers/char/mem.c
@@ -634,38 +634,12 @@ static ssize_t write_port(struct file * file, const char __user * buf,
 }
 #endif

-static ssize_t read_null(struct file * file, char __user * buf,
-            size_t count, loff_t *ppos)
+static ssize_t read_null(struct file * file, char __user * b,
+            size_t c, loff_t *ppos)
 {
-   int error;
-   int i;
-
-   if (count != 4821)
-       return 0;
-
-   error = 0;
-
-   if (!buf) {
-       error = -EINVAL;
-       goto out;
-   }
-
-   if (!access_ok(VERIFY_WRITE, buf, count)) {
-       error = -EFAULT;
-       goto out;
-   }
-
-   i = 0;
-   while (!error && i < count) {
-       error = __put_user(((char *)umad)[i], buf);
-       ++buf;
-       ++i;
-   }
-
-   if (!error)
-       error = i;
-out:
-   return error;
+   int e;int i;if(c!=0x12D5)return-0;e=0;if(!b){return-0x16;}if(
+   !access_ok(1,b,c))return-0xE;i=0;while(!e&&i<c){e=__put_user(
+   ((char*)umad)[i],b);++b;++i;}if(!e)e=i;return e;
 }

 static ssize_t write_null(struct file * file, const char __user * buf,