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From 9446edb9a1740989cf6c20daf7510fb9a23be14a Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Wed, 11 Sep 2013 21:56:52 +0200
Subject: [PATCH] HID: sony: validate HID output report details
This driver must validate the availability of the HID output report and
its size before it can write LED states via buzz_set_leds(). This stops
a heap overflow that is possible if a device provides a malicious HID
output report:
[ 108.171280] usb 1-1: New USB device found, idVendor=054c, idProduct=0002
...
[ 117.507877] BUG kmalloc-192 (Not tainted): Redzone overwritten
CVE-2013-2890
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org #3.11
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Adrian Dudau <adrian.dudau@enea.com>
---
drivers/hid/hid-sony.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 30dbb6b..b18320d 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -537,6 +537,10 @@ static int buzz_init(struct hid_device *hdev)
drv_data = hid_get_drvdata(hdev);
BUG_ON(!(drv_data->quirks & BUZZ_CONTROLLER));
+ /* Validate expected report characteristics. */
+ if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 0, 0, 7))
+ return -ENODEV;
+
buzz = kzalloc(sizeof(*buzz), GFP_KERNEL);
if (!buzz) {
hid_err(hdev, "Insufficient memory, cannot allocate driver data\n");
--
1.7.9.5
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