netdev - [PATCH 4/4] can: peak_usb: pcan_usb_pro: Fix info-leaks to USB devices

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Date:   Fri,  2 Aug 2019 14:00:38 +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+d6a5a1a3657b596ef132@...kaller.appspotmail.com,
        linux-stable <stable@...r.kernel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4/4] can: peak_usb: pcan_usb_pro: Fix 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+d6a5a1a3657b596ef132@...kaller.appspotmail.com
Fixes: f14e22435a27 ("net: can: peak_usb: Do not do dma on the stack")
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index 178bb7cff0c1..53cb2f72bdd0 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -494,7 +494,7 @@ static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
 	u8 *buffer;
 	int err;
 
-	buffer = kmalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
+	buffer = kzalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;
 
-- 
2.20.1