[PATCH 3.14 047/238] HID: picolcd: sanity check report size in raw_event() callback

From: Greg Kroah-Hartman
Date: Fri Oct 03 2014 - 18:01:55 EST


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

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

From: Jiri Kosina <jkosina@xxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
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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