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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201223021813.2791612-74-sashal@kernel.org>
Date:   Tue, 22 Dec 2020 21:17:17 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        syzbot <syzkaller@...glegroups.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 074/130] media: gp8psk: initialize stats at power control logic

From: Mauro Carvalho Chehab <mchehab+huawei@...nel.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@...glegroups.com>
Reported-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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