linux-kernel - [PATCH 1/1] HID: hyperv: Correctly access fields declared as _

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Date:   Tue,  7 Jun 2022 20:49:37 -0700
From:   Michael Kelley <mikelley@...rosoft.com>
To:     sthemmin@...rosoft.com, kys@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, haiyangz@...rosoft.com, jikos@...nel.org,
        benjamin.tissoires@...hat.com, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-input@...r.kernel.org
Cc:     mikelley@...rosoft.com
Subject: [PATCH 1/1] HID: hyperv: Correctly access fields declared as __le16

Add the use of le16_to_cpu() for fields declared as __le16. Because
Hyper-V only runs in Little Endian mode, there's no actual bug.
The change is made in the interest of general correctness in
addition to making sparse happy. No functional change.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 drivers/hid/hid-hyperv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
index 978ee2a..e0bc731 100644
--- a/drivers/hid/hid-hyperv.c
+++ b/drivers/hid/hid-hyperv.c
@@ -199,7 +199,8 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 	if (!input_device->hid_desc)
 		goto cleanup;
 
-	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
+	input_device->report_desc_size = le16_to_cpu(
+					desc->desc[0].wDescriptorLength);
 	if (input_device->report_desc_size == 0) {
 		input_device->dev_info_status = -EINVAL;
 		goto cleanup;
@@ -217,7 +218,7 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 
 	memcpy(input_device->report_desc,
 	       ((unsigned char *)desc) + desc->bLength,
-	       desc->desc[0].wDescriptorLength);
+	       le16_to_cpu(desc->desc[0].wDescriptorLength));
 
 	/* Send the ack */
 	memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
-- 
1.8.3.1