linux-kernel - [PATCH 3.16 21/83] can: peak_usb: pcan_usb

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Date:   Wed, 20 Nov 2019 15:37:31 +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>,
        "Tomas Bortoli" <tomasbortoli@...il.com>,
        syzbot+d6a5a1a3657b596ef132@...kaller.appspotmail.com,
        "Marc Kleine-Budde" <mkl@...gutronix.de>
Subject: [PATCH 3.16 21/83] can: peak_usb: pcan_usb_pro: Fix info-leaks to
 USB devices

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

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

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

commit ead16e53c2f0ed946d82d4037c630e2f60f4ab69 upstream.

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")
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_pro.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -508,7 +508,7 @@ static int pcan_usb_pro_drv_loaded(struc
 	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;