linux-kernel - [PATCH 4.9 36/68] media: gspca: zero usb

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Message-Id: <20200203161910.889671568@linuxfoundation.org>
Date:   Mon,  3 Feb 2020 16:19:32 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        syzbot+32310fc2aea76898d074@...kaller.appspotmail.com,
        syzbot+99706d6390be1ac542a2@...kaller.appspotmail.com,
        syzbot+64437af5c781a7f0e08e@...kaller.appspotmail.com
Subject: [PATCH 4.9 36/68] media: gspca: zero usb_buf

From: Hans Verkuil <hverkuil-cisco@...all.nl>

commit de89d0864f66c2a1b75becfdd6bf3793c07ce870 upstream.

Allocate gspca_dev->usb_buf with kzalloc instead of kmalloc to
ensure it is property zeroed. This fixes various syzbot errors
about uninitialized data.

Syzbot links:

https://syzkaller.appspot.com/bug?extid=32310fc2aea76898d074
https://syzkaller.appspot.com/bug?extid=99706d6390be1ac542a2
https://syzkaller.appspot.com/bug?extid=64437af5c781a7f0e08e

Reported-and-tested-by: syzbot+32310fc2aea76898d074@...kaller.appspotmail.com
Reported-and-tested-by: syzbot+99706d6390be1ac542a2@...kaller.appspotmail.com
Reported-and-tested-by: syzbot+64437af5c781a7f0e08e@...kaller.appspotmail.com

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/media/usb/gspca/gspca.c
+++ b/drivers/media/usb/gspca/gspca.c
@@ -2043,7 +2043,7 @@ int gspca_dev_probe2(struct usb_interfac
 		pr_err("couldn't kzalloc gspca struct\n");
 		return -ENOMEM;
 	}
-	gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
+	gspca_dev->usb_buf = kzalloc(USB_BUF_SZ, GFP_KERNEL);
 	if (!gspca_dev->usb_buf) {
 		pr_err("out of memory\n");
 		ret = -ENOMEM;