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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Sean Young <sean@mess.org>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        syzbot+6bf9606ee955b646c0e1@syzkaller.appspotmail.com
Subject: [PATCH 5.4 19/90] media: dvb-usb/dvb-usb-urb.c: initialize actlen to 0
Date:   Mon,  3 Feb 2020 16:19:22 +0000
Message-Id: <20200203161920.218827702@linuxfoundation.org>
In-Reply-To: <20200203161917.612554987@linuxfoundation.org>
References: <20200203161917.612554987@linuxfoundation.org>
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From: Hans Verkuil <hverkuil-cisco@xs4all.nl>

commit 569bc8d6a6a50acb5fcf07fb10b8d2d461fdbf93 upstream.

This fixes a syzbot failure since actlen could be uninitialized,
but it was still used.

Syzbot link:

https://syzkaller.appspot.com/bug?extid=6bf9606ee955b646c0e1

Reported-and-tested-by: syzbot+6bf9606ee955b646c0e1@syzkaller.appspotmail.com

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/media/usb/dvb-usb/dvb-usb-urb.c
+++ b/drivers/media/usb/dvb-usb/dvb-usb-urb.c
@@ -12,7 +12,7 @@
 int dvb_usb_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
 	u16 rlen, int delay_ms)
 {
-	int actlen,ret = -ENOMEM;
+	int actlen = 0, ret = -ENOMEM;
 
 	if (!d || wbuf == NULL || wlen == 0)
 		return -EINVAL;