linux-kernel - [PATCH 5.10 049/141] media: flexcop-usb: fix endpoint type check

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Date:   Mon, 26 Sep 2022 12:11:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        Dongliang Mu <mudongliangabcd@...il.com>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 5.10 049/141] media: flexcop-usb: fix endpoint type check

From: Johan Hovold <johan@...nel.org>

commit 763679f0eeff0185fc431498849bbc1c24460875 upstream.

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>
Link: https://lore.kernel.org/r/20220822151027.27026-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/usb/b2c2/flexcop-usb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/b2c2/flexcop-usb.c
+++ b/drivers/media/usb/b2c2/flexcop-usb.c
@@ -512,7 +512,7 @@ static int flexcop_usb_init(struct flexc
 
 	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) {