[PATCH] Input: cyttsp5 - clamp the HID report size before memcpy

The size field comes from the device and is used as the memcpy()
length into response_buf, which is CY_MAX_INPUT bytes.

Fixes: 5b0c03e24a06 ("Input: Add driver for Cypress Generation 5 touchscreen")
Signed-off-by: Linkai Gong <redacted>
---
 drivers/input/touchscreen/cyttsp5.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/touchscreen/cyttsp5.c b/drivers/input/touchscreen/cyttsp5.c
index 9266c07314be..e878a02dc9b7 100644
--- a/drivers/input/touchscreen/cyttsp5.c
+++ b/drivers/input/touchscreen/cyttsp5.c

@@ -710,6 +710,7 @@ static irqreturn_t cyttsp5_handle_irq(int irq, void *handle)
 		size = 2;
 	} else {
 		report_id = ts->input_buf[2];
+		size = min(size, CY_MAX_INPUT);
 	}
 
 	switch (report_id) {

-- 
2.25.1