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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        syzbot+d93dff37e6a89431c158@syzkaller.appspotmail.com,
        Oliver Neukum <oneukum@suse.com>, Sean Young <sean@mess.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>
Subject: [PATCH 4.14 193/211] media: b2c2-flexcop-usb: add sanity checking
Date:   Wed, 27 Nov 2019 21:32:06 +0100
Message-Id: <20191127203111.901416984@linuxfoundation.org>
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From: Oliver Neukum <oneukum@suse.com>

commit 1b976fc6d684e3282914cdbe7a8d68fdce19095c upstream.

The driver needs an isochronous endpoint to be present. It will
oops in its absence. Add checking for it.

Reported-by: syzbot+d93dff37e6a89431c158@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/usb/b2c2/flexcop-usb.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/media/usb/b2c2/flexcop-usb.c
+++ b/drivers/media/usb/b2c2/flexcop-usb.c
@@ -537,6 +537,9 @@ static int flexcop_usb_probe(struct usb_
 	struct flexcop_device *fc = NULL;
 	int ret;
 
+	if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_usb))) == NULL) {
 		err("out of memory\n");
 		return -ENOMEM;