diff options
| author | Kees Cook <keescook@chromium.org> | 2013-09-11 21:56:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-05 07:06:54 -0700 |
| commit | f28b823bd4509368d2446a42c9f02bbcc369f275 (patch) | |
| tree | 114edd63eb2f34e4366e9eabe56d96252b887605 /drivers/hid/hid-lg2ff.c | |
| parent | 0d39cce32ae80b52a37eb756bfd7b59ac370ffee (diff) | |
HID: LG: validate HID output report details
commit 0fb6bd06e06792469acc15bbe427361b56ada528 upstream.
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 <keescook@chromium.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hid/hid-lg2ff.c')
| -rw-r--r-- | drivers/hid/hid-lg2ff.c | 19 |
1 files changed, 3 insertions, 16 deletions
diff --git a/drivers/hid/hid-lg2ff.c b/drivers/hid/hid-lg2ff.c index 3c31bc650e5d..128f0117c7a7 100644 --- a/drivers/hid/hid-lg2ff.c +++ b/drivers/hid/hid-lg2ff.c @@ -66,26 +66,13 @@ 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) |