From 0fb6bd06e06792469acc15bbe427361b56ada528 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 11 Sep 2013 21:56:54 +0200 Subject: HID: LG: validate HID output report details A HID device could send a malicious output report that would cause the lg, lg3, and lg4 HID drivers to write beyond the output report allocation during an event, causing a heap overflow: [ 325.245240] usb 1-1: New USB device found, idVendor=046d, idProduct=c287 ... [ 414.518960] BUG kmalloc-4096 (Not tainted): Redzone overwritten Additionally, while lg2 did correctly validate the report details, it was cleaned up and shortened. CVE-2013-2893 Signed-off-by: Kees Cook Cc: stable@vger.kernel.org Reviewed-by: Benjamin Tissoires Signed-off-by: Jiri Kosina --- drivers/hid/hid-lg2ff.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) (limited to 'drivers/hid/hid-lg2ff.c') diff --git a/drivers/hid/hid-lg2ff.c b/drivers/hid/hid-lg2ff.c index b3cd1507dda2..1a42eaa6ca02 100644 --- a/drivers/hid/hid-lg2ff.c +++ b/drivers/hid/hid-lg2ff.c @@ -64,26 +64,13 @@ int lg2ff_init(struct hid_device *hid) struct hid_report *report; struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); - struct list_head *report_list = - &hid->report_enum[HID_OUTPUT_REPORT].report_list; struct input_dev *dev = hidinput->input; int error; - if (list_empty(report_list)) { - hid_err(hid, "no output report found\n"); + /* Check that the report looks ok */ + report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7); + if (!report) return -ENODEV; - } - - report = list_entry(report_list->next, struct hid_report, list); - - if (report->maxfield < 1) { - hid_err(hid, "output report is empty\n"); - return -ENODEV; - } - if (report->field[0]->report_count < 7) { - hid_err(hid, "not enough values in the field\n"); - return -ENODEV; - } lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL); if (!lg2ff) -- cgit v1.2.3