USB: uss720: fix DMA-buffer allocation
Make sure the USB control request is allocated separately from
containing structure to prevent potential memory corruption on
non-cache-coherent systems.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/misc/uss720.c b/drivers/usb/misc/uss720.c
index e129cf6..40ef40a 100644
--- a/drivers/usb/misc/uss720.c
+++ b/drivers/usb/misc/uss720.c
@@ -75,7 +75,7 @@
struct list_head asynclist;
struct completion compl;
struct urb *urb;
- struct usb_ctrlrequest dr;
+ struct usb_ctrlrequest *dr;
__u8 reg[7];
};
@@ -98,6 +98,7 @@
if (likely(rq->urb))
usb_free_urb(rq->urb);
+ kfree(rq->dr);
spin_lock_irqsave(&priv->asynclock, flags);
list_del_init(&rq->asynclist);
spin_unlock_irqrestore(&priv->asynclock, flags);
@@ -120,7 +121,7 @@
if (status) {
dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
status);
- } else if (rq->dr.bRequest == 3) {
+ } else if (rq->dr->bRequest == 3) {
memcpy(priv->reg, rq->reg, sizeof(priv->reg));
#if 0
dev_dbg(&priv->usbdev->dev,
@@ -152,7 +153,7 @@
usbdev = priv->usbdev;
if (!usbdev)
return NULL;
- rq = kmalloc(sizeof(struct uss720_async_request), mem_flags);
+ rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
if (!rq) {
dev_err(&usbdev->dev, "submit_async_request out of memory\n");
return NULL;
@@ -168,13 +169,18 @@
dev_err(&usbdev->dev, "submit_async_request out of memory\n");
return NULL;
}
- rq->dr.bRequestType = requesttype;
- rq->dr.bRequest = request;
- rq->dr.wValue = cpu_to_le16(value);
- rq->dr.wIndex = cpu_to_le16(index);
- rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
+ rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
+ if (!rq->dr) {
+ kref_put(&rq->ref_count, destroy_async);
+ return NULL;
+ }
+ rq->dr->bRequestType = requesttype;
+ rq->dr->bRequest = request;
+ rq->dr->wValue = cpu_to_le16(value);
+ rq->dr->wIndex = cpu_to_le16(index);
+ rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
- (unsigned char *)&rq->dr,
+ (unsigned char *)rq->dr,
(request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
/* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
spin_lock_irqsave(&priv->asynclock, flags);