linux-kernel - [PATCH] media: flexcop-usb: fix endpoint type check

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Message-Id: <20220609135341.19941-1-johan@kernel.org>
Date:   Thu,  9 Jun 2022 15:53:41 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Sean Young <sean@...s.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Oliver Neukum <oneukum@...e.com>, stable@...r.kernel.org,
        Dongliang Mu <mudongliangabcd@...il.com>
Subject: [PATCH] media: flexcop-usb: fix endpoint type check

Commit d725d20e81c2 ("media: flexcop-usb: sanity checking of endpoint
type") tried to add an endpoint type sanity check for the single
isochronous endpoint but instead broke the driver by checking the wrong
descriptor or random data beyond the last endpoint descriptor.

Make sure to check the right endpoint descriptor.

Fixes: d725d20e81c2 ("media: flexcop-usb: sanity checking of endpoint type")
Cc: Oliver Neukum <oneukum@...e.com>
Cc: stable@...r.kernel.org	# 5.9
Reported-by: Dongliang Mu <mudongliangabcd@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/media/usb/b2c2/flexcop-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/b2c2/flexcop-usb.c b/drivers/media/usb/b2c2/flexcop-usb.c
index 7835bb0f32fc..e012b21c4fd7 100644
--- a/drivers/media/usb/b2c2/flexcop-usb.c
+++ b/drivers/media/usb/b2c2/flexcop-usb.c
@@ -511,7 +511,7 @@ static int flexcop_usb_init(struct flexcop_usb *fc_usb)
 
 	if (fc_usb->uintf->cur_altsetting->desc.bNumEndpoints < 1)
 		return -ENODEV;
-	if (!usb_endpoint_is_isoc_in(&fc_usb->uintf->cur_altsetting->endpoint[1].desc))
+	if (!usb_endpoint_is_isoc_in(&fc_usb->uintf->cur_altsetting->endpoint[0].desc))
 		return -ENODEV;
 
 	switch (fc_usb->udev->speed) {
-- 
2.35.1