linux-kernel - [PATCH v2] media: uvc_video: fix bit overflow in uvc_probe

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Date:   Fri, 25 Mar 2022 10:23:37 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     laurent.pinchart@...asonboard.com, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v2] media: uvc_video: fix bit overflow in uvc_probe_video

probe->dwMaxPayloadTransferSize is a 32bit value, but bandwidth is 16bit. This
may lead to a bit overflow.

Fix this by using probe->dwMaxPayloadTransferSize directly.

Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---

v2: 
Use probe->dwMaxPayloadTransferSize directly instead of changing temporary 
variable.

 drivers/media/usb/uvc/uvc_video.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 1b4cc934109e..e016f88bdf96 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -383,7 +383,6 @@ int uvc_probe_video(struct uvc_streaming *stream,
 	struct uvc_streaming_control *probe)
 {
 	struct uvc_streaming_control probe_min, probe_max;
-	u16 bandwidth;
 	unsigned int i;
 	int ret;
 
@@ -421,8 +420,7 @@ int uvc_probe_video(struct uvc_streaming *stream,
 		if (stream->intf->num_altsetting == 1)
 			break;
 
-		bandwidth = probe->dwMaxPayloadTransferSize;
-		if (bandwidth <= stream->maxpsize)
+		if (probe->dwMaxPayloadTransferSize <= stream->maxpsize)
 			break;
 
 		if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
-- 
2.25.1