linux-kernel - [PATCH 3.16 49/72] media: b2c2-flexcop-usb: add sanity checking

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Message-ID: <lsq.1575813165.118383647@decadent.org.uk>
Date:   Sun, 08 Dec 2019 13:53:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        syzbot+d93dff37e6a89431c158@...kaller.appspotmail.com,
        "Oliver Neukum" <oneukum@...e.com>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        "Sean Young" <sean@...s.org>
Subject: [PATCH 3.16 49/72] media: b2c2-flexcop-usb: add sanity checking

3.16.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Oliver Neukum <oneukum@...e.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@...kaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -508,6 +508,9 @@ 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;