[PATCH 3/7] media: redrat3: Ensure we don't read beyond the end of the packet

[Sean Young]

The length and offset is provided by the usb device, so it should be
validated.

Fixes: 2154be651b90 ("[media] redrat3: new rc-core IR transceiver device driver")
Signed-off-by: Sean Young <sean@xxxxxxxx>
---
 drivers/media/rc/redrat3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/rc/redrat3.c b/drivers/media/rc/redrat3.c
index d2a805dbd3f3..424f8b9e4d17 100644
--- a/drivers/media/rc/redrat3.c
+++ b/drivers/media/rc/redrat3.c
@@ -358,8 +358,18 @@ static void redrat3_process_ir_data(struct redrat3_dev *rr3)
 
 	/* process each rr3 encoded byte into an int */
 	sig_size = be16_to_cpu(rr3->irdata.sig_size);
+
+	if (sig_size > RR3_MAX_SIG_SIZE) {
+		dev_err(dev, "length %u is incorrect\n", sig_size);
+		return;
+	}
+
 	for (i = 0; i < sig_size; i++) {
 		offset = rr3->irdata.sigdata[i];
+		if (offset >= RR3_DRIVER_MAXLENS) {
+			dev_err(dev, "offset %u is incorrect\n", offset);
+			return;
+		}
 		val = get_unaligned_be16(&rr3->irdata.lens[offset]);
 
 		/* we should always get pulse/space/pulse/space samples */
-- 
2.55.0