linux-kernel - [ 075/117] HID: sensor-hub: validate feature report details

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Date:	Tue, 24 Sep 2013 17:19:01 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jiri Kosina <jkosina@...e.cz>
Subject: [ 075/117] HID: sensor-hub: validate feature report details

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit 9e8910257397372633e74b333ef891f20c800ee4 upstream.

A HID device could send a malicious feature report that would cause the
sensor-hub HID driver to read past the end of heap allocation, leaking
kernel memory contents to the caller.

CVE-2013-2898

Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/hid-sensor-hub.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -221,7 +221,8 @@ int sensor_hub_get_feature(struct hid_se
 
 	mutex_lock(&data->mutex);
 	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
-	if (!report || (field_index >=  report->maxfield)) {
+	if (!report || (field_index >=  report->maxfield) ||
+	    report->field[field_index]->report_count < 1) {
 		ret = -EINVAL;
 		goto done_proc;
 	}


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