linux-kernel - [PATCH v2] media: cxusb: fix uninitialized var in cxusb_gpio

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Message-Id: <20250405073159.87021-1-superman.xpt@gmail.com>
Date: Sat,  5 Apr 2025 00:31:59 -0700
From: Penglei Jiang <superman.xpt@...il.com>
To: mkrufky@...uxtv.org,
	mchehab@...nel.org
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Penglei Jiang <superman.xpt@...il.com>
Subject: [PATCH v2] media: cxusb: fix uninitialized var in cxusb_gpio_tuner()

The function cxusb_ctrl_msg() may not set the value of the variable i,
but the code uses it later. Initialize the local variable i to 0 to
prevent potential issues.

Reported-by: syzbot+526bd95c0ec629993bf3@...kaller.appspotmail.com
Closes: https://lore.kernel.org/all/67f092b5.050a0220.0a13.0229.GAE@google.com
Signed-off-by: Penglei Jiang <superman.xpt@...il.com>
---
V1 -> V2: Updated the Subject

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

diff --git a/drivers/media/usb/dvb-usb/cxusb.c b/drivers/media/usb/dvb-usb/cxusb.c
index f44529b40989..7fe858bb665e 100644
--- a/drivers/media/usb/dvb-usb/cxusb.c
+++ b/drivers/media/usb/dvb-usb/cxusb.c
@@ -111,7 +111,7 @@ int cxusb_ctrl_msg(struct dvb_usb_device *d,
 static void cxusb_gpio_tuner(struct dvb_usb_device *d, int onoff)
 {
 	struct cxusb_state *st = d->priv;
-	u8 o[2], i;
+	u8 o[2], i = 0;
 
 	if (st->gpio_write_state[GPIO_TUNER] == onoff &&
 	    !st->gpio_write_refresh[GPIO_TUNER])
-- 
2.17.1