From cd6104572bca9e4afe0dcdb8ecd65ef90b01297b Mon Sep 17 00:00:00 2001 From: Adam Kropelin Date: Tue, 13 Dec 2005 17:03:39 -0800 Subject: [PATCH] hid-core: Zero-pad truncated reports When it detects a truncated report, hid-core emits a warning and then processes the report as usual. This is good because it allows buggy devices to still get data thru to userspace. However, the missing bytes of the report should be cleared before processing, otherwise userspace will be handed partially-uninitialized data. This fixes Debian tracker bug #330487. Signed-off-by: Adam Kropelin Cc: Vojtech Pavlik Acked-by: Dmitry Torokhov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/usb/input/hid-core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/input/hid-core.c b/drivers/usb/input/hid-core.c index 45f3130fade..a3e44ef1df4 100644 --- a/drivers/usb/input/hid-core.c +++ b/drivers/usb/input/hid-core.c @@ -893,8 +893,10 @@ static int hid_input_report(int type, struct urb *urb, int interrupt, struct pt_ size = ((report->size - 1) >> 3) + 1; - if (len < size) + if (len < size) { dbg("report %d is too short, (%d < %d)", report->id, len, size); + memset(data + len, 0, size - len); + } if (hid->claimed & HID_CLAIMED_HIDDEV) hiddev_report_event(hid, report); -- cgit v1.2.3-70-g09d2