HID: debug: check length before copy_to_user()

commit 717adfdaf14704fd3ec7fa2c04520c0723247eac upstream.

If our length is greater than the size of the buffer, we
overflow the buffer

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index 8bf61d295ffd7efd638e1f14570508e9c8498f50..7192fa1d2786c109d17f7a7a2f414ef726a05f98 100644 (file)
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -1150,6 +1150,8 @@ copy_rest:
                        goto out;
                if (list->tail > list->head) {
                        len = list->tail - list->head;
+                       if (len > count)
+                               len = count;
 
                        if (copy_to_user(buffer + ret, &list->hid_debug_buf[list->head], len)) {
                                ret = -EFAULT;
@@ -1159,6 +1161,8 @@ copy_rest:
                        list->head += len;
                } else {
                        len = HID_DEBUG_BUFSIZE - list->head;
+                       if (len > count)
+                               len = count;
 
                        if (copy_to_user(buffer, &list->hid_debug_buf[list->head], len)) {
                                ret = -EFAULT;
@@ -1166,7 +1170,9 @@ copy_rest:
                        }
                        list->head = 0;
                        ret += len;
-                       goto copy_rest;
+                       count -= len;
+                       if (count > 0)
+                               goto copy_rest;
                }
 
        }