[PATCH] /fs/proc/: 'larger than buffer size' memory accessed by clear_user()

Address a potential 'larger than buffer size' memory access by
clear_user().  Without this patch, this call to clear_user() can attempt to
clear too many (tsz) bytes resulting in a wrong (-EFAULT) return code by
read_kcore().
Signed-off-by: NAdam B. Jerome <abj@novell.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/proc/kcore.c

@@ -382,7 +382,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
 				 */
 				if (n) { 
 					if (clear_user(buffer + tsz - n,
-								tsz - n))
+								n))
 						return -EFAULT;
 				}
 			} else {