rtl8150: Use heap buffers for all register access

commit 7926aff5c57b577ab0f43364ff0c59d968f6a414 upstream.

Allocating USB buffers on the stack is not portable, and no longer
works on x86_64 (with VMAP_STACK enabled as per default).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index 6cbdac67f3a0d3f899b0a3ca783d427b2e1c9704..59d6a3a5830a53b1cb4452d4d21eef6339f24a93 100644 (file)
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -156,16 +156,36 @@ 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)