1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index cd4ece6fdfb9..56f314fbd4f9 100644
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -29,6 +29,7 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/poll.h>
 
@@ -564,10 +565,10 @@ void hid_debug_event(struct hid_device *hdev, char *buf)
         struct hid_debug_list *list;
 
         list_for_each_entry(list, &hdev->debug_list, node) {
-                for (i = 0; i <= strlen(buf); i++)
-                        list->hid_debug_buf[(list->tail + i) % (HID_DEBUG_BUFSIZE - 1)] =
+                for (i = 0; i < strlen(buf); i++)
+                        list->hid_debug_buf[(list->tail + i) % HID_DEBUG_BUFSIZE] =
                                 buf[i];
-                list->tail = (list->tail + i) % (HID_DEBUG_BUFSIZE - 1);
+                list->tail = (list->tail + i) % HID_DEBUG_BUFSIZE;
         }
 }
 EXPORT_SYMBOL_GPL(hid_debug_event);