[PATCH AUTOSEL 5.4 074/130] media: gp8psk: initialize stats at power control logic

Sasha Levin
2020-12-23T02:21:10Z

From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

[ Upstream commit d0ac1a26ed5943127cb0156148735f5f52a07075 ]

As reported on:
https://lore.kernel.org/linux-media/20190627222020.45909-1-willemdebruijn.kernel@gmail.com/

if gp8psk_usb_in_op() returns an error, the status var is not
initialized. Yet, this var is used later on, in order to
identify:
- if the device was already started;
- if firmware has loaded;
- if the LNBf was powered on.

Using status = 0 seems to ensure that everything will be
properly powered up.

So, instead of the proposed solution, let's just set
status = 0.

Reported-by: syzbot <syzkaller@googlegroups.com>
Reported-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/usb/dvb-usb/gp8psk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb/gp8psk.c b/drivers/media/usb/dvb-usb/gp8psk.c
index 1282f701f1857..ac8b8bf6ee1d3 100644
--- a/drivers/media/usb/dvb-usb/gp8psk.c
+++ b/drivers/media/usb/dvb-usb/gp8psk.c
@@ -182,7 +182,7 @@ static int gp8psk_load_bcm4500fw(struct dvb_usb_device *d)

static int gp8psk_power_ctrl(struct dvb_usb_device *d, int onoff)
{
- u8 status, buf;
+ u8 status = 0, buf;
int gp_product_id = le16_to_cpu(d->udev->descriptor.idProduct);

if (onoff) {
--
2.27.0