linux-kernel - [PATCH 4.19 18/29] media: gp8psk: initialize stats at power control logic

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Message-Id: <20210105090820.873323140@linuxfoundation.org>
Date:   Tue,  5 Jan 2021 10:29:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, syzbot <syzkaller@...glegroups.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH 4.19 18/29] media: gp8psk: initialize stats at power control logic

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

commit d0ac1a26ed5943127cb0156148735f5f52a07075 upstream.

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@...glegroups.com>
Reported-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/usb/dvb-usb/gp8psk.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/dvb-usb/gp8psk.c
+++ b/drivers/media/usb/dvb-usb/gp8psk.c
@@ -185,7 +185,7 @@ out_rel_fw:
 
 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) {