From: Kees Cook <keesc...@chromium.org>
The zeroplus HID driver was not checking the size of allocated values
in fields it used. A HID device could send a malicious output report
that would cause the driver to write beyond the output report allocation
during initialization, causing a heap overflow:
[ 1442.728680] usb 1-1: New USB device found, idVendor=0c12, idProduct=0005
...
[ 1466.243173] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten
CVE-2013-2889
Signed-off-by: Kees Cook <keesc...@chromium.org>
Cc: sta...@kernel.org
---
drivers/hid/hid-zpff.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/drivers/hid/hid-zpff.c b/drivers/hid/hid-zpff.c
index 6ec28a3..b124991 100644
--- a/drivers/hid/hid-zpff.c
+++ b/drivers/hid/hid-zpff.c
@@ -68,22 +68,12 @@ static int zpff_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");
+ report = hid_validate_report(hid, HID_OUTPUT_REPORT, 0, 4, 1);
+ if (!report)
return -ENODEV;
- }
-
- report = list_entry(report_list->next, struct hid_report, list);
-
- if (report->maxfield < 4) {
- hid_err(hid, "not enough fields in report\n");
- return -ENODEV;
- }
zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
if (!zpff)
--
Jiri Kosina
SUSE Labs
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