can: peak_usb: pcan_usb_fd: Fix info-leaks to USB devices

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@gmail.com>
Reported-by: syzbot+513e4d0985298538bf9b@syzkaller.appspotmail.com
Fixes: 0a25e1f4f185 ("can: peak_usb: add support for PEAK new CANFD USB adapters")
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

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 34761c3a62867d1001f48224bd9e51b1685bbb74..47cc1ff5b88e828fe65899b8ef38b447ae1da098 100644 (file)
--- 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;