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rtlwifi: usb: allocate URB control message setup_packet and data buffer separately 

rtlwifi allocates both setup_packet and data buffer of control message urb,
using shared kmalloc in _usbctrl_vendorreq_async_write. Structure used for
allocating is:
	struct {
		u8 data[254];
		struct usb_ctrlrequest dr;
	};

Because 'struct usb_ctrlrequest' is __packed, setup packet is unaligned and
DMA mapping of both 'data' and 'dr' confuses ARM/sunxi, leading to memory
corruptions and freezes.

Patch changes setup packet to be allocated separately.

[v2]:
 - Use WARN_ON_ONCE instead of WARN_ON

Cc: <stable@vger.kernel.org>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jussi Kivilinna 2013-02-18 10:29:30 +02:00 committed by John W. Linville
parent a5f390562a
commit bc6b89237a
1 changed files with 29 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/net/wireless/rtlwifi/usb.c
View File

@ -42,8 +42,12 @@
static void usbctrl_async_callback(struct urb *urb)
{
if (urb)
kfree(urb->context);
if (urb) {
/* free dr */
kfree(urb->setup_packet);
/* free databuf */
kfree(urb->transfer_buffer);
}
}
static int _usbctrl_vendorreq_async_write(struct usb_device *udev, u8 request,
@ -55,25 +59,31 @@ static int _usbctrl_vendorreq_async_write(struct usb_device *udev, u8 request,
u8 reqtype;
struct usb_ctrlrequest *dr;
struct urb *urb;
struct rtl819x_async_write_data {
u8 data[REALTEK_USB_VENQT_MAX_BUF_SIZE];
struct usb_ctrlrequest dr;
} *buf;
const u16 databuf_maxlen = REALTEK_USB_VENQT_MAX_BUF_SIZE;
u8 *databuf;
if (WARN_ON_ONCE(len > databuf_maxlen))
len = databuf_maxlen;
pipe = usb_sndctrlpipe(udev, 0); /* write_out */
reqtype = REALTEK_USB_VENQT_WRITE;
buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
if (!buf)
dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
if (!dr)
return -ENOMEM;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
kfree(buf);
databuf = kmalloc(databuf_maxlen, GFP_ATOMIC);
if (!databuf) {
kfree(dr);
return -ENOMEM;
}
dr = &buf->dr;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
kfree(databuf);
kfree(dr);
return -ENOMEM;
}
dr->bRequestType = reqtype;
dr->bRequest = request;
@ -81,13 +91,15 @@ static int _usbctrl_vendorreq_async_write(struct usb_device *udev, u8 request,
dr->wIndex = cpu_to_le16(index);
dr->wLength = cpu_to_le16(len);
/* data are already in little-endian order */
memcpy(buf, pdata, len);
memcpy(databuf, pdata, len);
usb_fill_control_urb(urb, udev, pipe,
(unsigned char *)dr, buf, len,
usbctrl_async_callback, buf);
(unsigned char *)dr, databuf, len,
usbctrl_async_callback, NULL);
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (rc < 0)
kfree(buf);
if (rc < 0) {
kfree(databuf);
kfree(dr);
}
usb_free_urb(urb);
return rc;
}