linux-kernel - [PATCH 3.16 065/357] HID: picolcd: sanity check report size in raw

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Message-Id: <20141003212935.412773594@linuxfoundation.org>
Date:	Fri,  3 Oct 2014 14:27:31 -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, Steven Vittitoe <scvitti@...gle.com>,
	Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 3.16 065/357] HID: picolcd: sanity check report size in raw_event() callback

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

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

From: Jiri Kosina <jkosina@...e.cz>

commit 844817e47eef14141cf59b8d5ac08dd11c0a9189 upstream.

The report passed to us from transport driver could potentially be
arbitrarily large, therefore we better sanity-check it so that raw_data
that we hold in picolcd_pending structure are always kept within proper
bounds.

Reported-by: Steven Vittitoe <scvitti@...gle.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/hid-picolcd_core.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/hid/hid-picolcd_core.c
+++ b/drivers/hid/hid-picolcd_core.c
@@ -350,6 +350,12 @@ static int picolcd_raw_event(struct hid_
 	if (!data)
 		return 1;
 
+	if (size > 64) {
+		hid_warn(hdev, "invalid size value (%d) for picolcd raw event\n",
+				size);
+		return 0;
+	}
+
 	if (report->id == REPORT_KEY_STATE) {
 		if (data->input_keys)
 			ret = picolcd_raw_keypad(data, report, raw_data+1, size-1);


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