[PATCH v2] net: can: usb: gs_usb: Fix buffer on stack

[Maksim Salau]

Allocate buffers on HEAP instead of STACK for local structures
that are to be sent using usb_control_msg().

Signed-off-by: Maksim Salau <maksim.sa...@gmail.com>
---
 Changes in v2:
   dropped redundant assignment.

 drivers/net/can/usb/gs_usb.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 300349f..eecee7f 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -739,13 +739,18 @@ static const struct net_device_ops gs_usb_netdev_ops = {
 static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
 {
        struct gs_can *dev = netdev_priv(netdev);
-       struct gs_identify_mode imode;
+       struct gs_identify_mode *imode;
        int rc;
 
+       imode = kmalloc(sizeof(*imode), GFP_KERNEL);
+
+       if (!imode)
+               return -ENOMEM;
+
        if (do_identify)
-               imode.mode = GS_CAN_IDENTIFY_ON;
+               imode->mode = GS_CAN_IDENTIFY_ON;
        else
-               imode.mode = GS_CAN_IDENTIFY_OFF;
+               imode->mode = GS_CAN_IDENTIFY_OFF;
 
        rc = usb_control_msg(interface_to_usbdev(dev->iface),
                             usb_sndctrlpipe(interface_to_usbdev(dev->iface),
@@ -755,10 +760,12 @@ static int gs_usb_set_identify(struct net_device *netdev, 
bool do_identify)
                             USB_RECIP_INTERFACE,
                             dev->channel,
                             0,
-                            &imode,
-                            sizeof(imode),
+                            imode,
+                            sizeof(*imode),
                             100);
 
+       kfree(imode);
+
        return (rc > 0) ? 0 : rc;
 }
 
-- 
2.9.3