[PATCH AUTOSEL 5.2 032/185] media: iguanair: add sanity checks

Sasha Levin
2019-09-22T19:28:43Z

From: Oliver Neukum <oneukum@suse.com>

[ Upstream commit ab1cbdf159beba7395a13ab70bc71180929ca064 ]

The driver needs to check the endpoint types, too, as opposed
to the number of endpoints. This also requires moving the check earlier.

Reported-by: syzbot+01a77b82edaa374068e1@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+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/rc/iguanair.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
index ea05e125016a7..872d6441e512c 100644
--- a/drivers/media/rc/iguanair.c
+++ b/drivers/media/rc/iguanair.c
@@ -413,6 +413,10 @@ static int iguanair_probe(struct usb_interface *intf,
int ret, pipein, pipeout;
struct usb_host_interface *idesc;

+ idesc = intf->altsetting;
+ if (idesc->desc.bNumEndpoints < 2)
+ return -ENODEV;
+
ir = kzalloc(sizeof(*ir), GFP_KERNEL);
rc = rc_allocate_device(RC_DRIVER_IR_RAW);
if (!ir || !rc) {
@@ -427,18 +431,13 @@ static int iguanair_probe(struct usb_interface *intf,
ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);

- if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
+ if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out ||
+ !usb_endpoint_is_int_in(&idesc->endpoint[0].desc) ||
+ !usb_endpoint_is_int_out(&idesc->endpoint[1].desc)) {
ret = -ENOMEM;
goto out;
}

- idesc = intf->altsetting;
-
- if (idesc->desc.bNumEndpoints < 2) {
- ret = -ENODEV;
- goto out;
- }
-
ir->rc = rc;
ir->dev = &intf->dev;
ir->udev = udev;
--
2.20.1