linux-kernel - [PATCH 3.16 72/72] can: peak

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Date:   Sun, 08 Dec 2019 13:53:56 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        syzbot+863724e7128e14b26732@...kaller.appspotmail.com,
        "Marc Kleine-Budde" <mkl@...gutronix.de>,
        "Johan Hovold" <johan@...nel.org>
Subject: [PATCH 3.16 72/72] can: peak_usb: fix slab info leak

3.16.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit f7a1337f0d29b98733c8824e165fca3371d7d4fd upstream.

Fix a small slab info leak due to a failure to clear the command buffer
at allocation.

The first 16 bytes of the command buffer are always sent to the device
in pcan_usb_send_cmd() even though only the first two may have been
initialised in case no argument payload is provided (e.g. when waiting
for a response).

Fixes: bb4785551f64 ("can: usb: PEAK-System Technik USB adapters driver core")
Reported-by: syzbot+863724e7128e14b26732@...kaller.appspotmail.com
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/can/usb/peak_usb/pcan_usb_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -732,7 +732,7 @@ static int peak_usb_create_dev(struct pe
 	dev = netdev_priv(netdev);
 
 	/* allocate a buffer large enough to send commands */
-	dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
+	dev->cmd_buf = kzalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
 	if (!dev->cmd_buf) {
 		err = -ENOMEM;
 		goto lbl_free_candev;