HID: logitech-dj: check report length
Malicious USB devices can send bogus reports smaller than the expected
buffer size. Ensure that the length is valid to avoid reading out of
bounds.
Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index c917ab6..5bc6d80 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -962,10 +962,24 @@
switch (data[0]) {
case REPORT_ID_DJ_SHORT:
+ if (size != DJREPORT_SHORT_LENGTH) {
+ dev_err(&hdev->dev, "DJ report of bad size (%d)", size);
+ return false;
+ }
return logi_dj_dj_event(hdev, report, data, size);
case REPORT_ID_HIDPP_SHORT:
- /* intentional fallthrough */
+ if (size != HIDPP_REPORT_SHORT_LENGTH) {
+ dev_err(&hdev->dev,
+ "Short HID++ report of bad size (%d)", size);
+ return false;
+ }
+ return logi_dj_hidpp_event(hdev, report, data, size);
case REPORT_ID_HIDPP_LONG:
+ if (size != HIDPP_REPORT_LONG_LENGTH) {
+ dev_err(&hdev->dev,
+ "Long HID++ report of bad size (%d)", size);
+ return false;
+ }
return logi_dj_hidpp_event(hdev, report, data, size);
}