netdev - [PATCH 3/4] can: peak_usb: pcan_usb_fd: uix info-leaks to USB devices

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Message-Id: <20190802120038.18154-4-mkl@pengutronix.de>
Date:   Fri,  2 Aug 2019 14:00:37 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Tomas Bortoli <tomasbortoli@...il.com>,
        syzbot+513e4d0985298538bf9b@...kaller.appspotmail.com,
        linux-stable <stable@...r.kernel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 3/4] can: peak_usb: pcan_usb_fd: uix info-leaks to USB devices

From: Tomas Bortoli <tomasbortoli@...il.com>

Uninitialized Kernel memory can leak to USB devices.

Fix by using kzalloc() instead of kmalloc() on the affected buffers.

Signed-off-by: Tomas Bortoli <tomasbortoli@...il.com>
Reported-by: syzbot+513e4d0985298538bf9b@...kaller.appspotmail.com
Fixes: 0a25e1f4f185 ("can: peak_usb: add support for PEAK new CANFD USB adapters")
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 34761c3a6286..47cc1ff5b88e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -841,7 +841,7 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 			goto err_out;
 
 		/* allocate command buffer once for all for the interface */
-		pdev->cmd_buffer_addr = kmalloc(PCAN_UFD_CMD_BUFFER_SIZE,
+		pdev->cmd_buffer_addr = kzalloc(PCAN_UFD_CMD_BUFFER_SIZE,
 						GFP_KERNEL);
 		if (!pdev->cmd_buffer_addr)
 			goto err_out_1;
-- 
2.20.1