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rtl8150: Use heap buffers for all register access
Allocating USB buffers on the stack is not portable, and no longer
works on x86_64 (with VMAP_STACK enabled as per default).

Fixes: 1da177e ("Linux-2.6.12-rc2")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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bwhacks authored and davem330 committed Feb 7, 2017
1 parent 5593523 commit 7926aff
Showing 1 changed file with 27 additions and 7 deletions.
34 changes: 27 additions & 7 deletions drivers/net/usb/rtl8150.c
Expand Up @@ -155,16 +155,36 @@ static const char driver_name [] = "rtl8150";
*/
static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
{
return usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
RTL8150_REQ_GET_REGS, RTL8150_REQT_READ,
indx, 0, data, size, 500);
void *buf;
int ret;

buf = kmalloc(size, GFP_NOIO);
if (!buf)
return -ENOMEM;

ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
RTL8150_REQ_GET_REGS, RTL8150_REQT_READ,
indx, 0, buf, size, 500);
if (ret > 0 && ret <= size)
memcpy(data, buf, ret);
kfree(buf);
return ret;
}

static int set_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
static int set_registers(rtl8150_t * dev, u16 indx, u16 size, const void *data)
{
return usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
RTL8150_REQ_SET_REGS, RTL8150_REQT_WRITE,
indx, 0, data, size, 500);
void *buf;
int ret;

buf = kmemdup(data, size, GFP_NOIO);
if (!buf)
return -ENOMEM;

ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
RTL8150_REQ_SET_REGS, RTL8150_REQT_WRITE,
indx, 0, buf, size, 500);
kfree(buf);
return ret;
}

static void async_set_reg_cb(struct urb *urb)
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