From: Jiri Kosina <jkosina@xxxxxxx>
3.4.104-rc1 review patch. If anyone has any objections, please let me know.
------------------
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>
[lizf: Backported to 3.4: adjust filename]
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
drivers/hid/hid-picolcd.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index 95f9047..4e37b1f 100644
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -2370,6 +2370,12 @@ static int picolcd_raw_event(struct hid_device *hdev,
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);
--
1.7.9.5
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