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| author | Johan Hovold <jhovold@gmail.com> | 2013-05-27 14:44:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-06-13 09:25:06 -0700 |
| commit | e9ab9a9031d6224f01577a8fdfe8d380882b8b25 (patch) | |
| tree | 5d0ad419bcf0c4e664a5e3d08ed3d9f1951a111f | |
| parent | 9afcad40de6d98484d3d12305830656b882f76f1 (diff) | |
| download | lwn-e9ab9a9031d6224f01577a8fdfe8d380882b8b25.tar.gz lwn-e9ab9a9031d6224f01577a8fdfe8d380882b8b25.zip | |
USB: mos7720: fix DMA to stack
commit 72ea18a558ed7a63a50bb121ba60d73b5b38ae30 upstream.
The read_mos_reg function is called with stack-allocated buffers, which
must not be used for control messages.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/serial/mos7720.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c index 40abedbc5943..f235390567df 100644 --- a/drivers/usb/serial/mos7720.c +++ b/drivers/usb/serial/mos7720.c @@ -234,11 +234,22 @@ static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, __u8 requesttype = (__u8)0xc0; __u16 index = get_reg_index(reg); __u16 value = get_reg_value(reg, serial_portnum); - int status = usb_control_msg(usbdev, pipe, request, requesttype, value, - index, data, 1, MOS_WDR_TIMEOUT); - if (status < 0) + u8 *buf; + int status; + + buf = kmalloc(1, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + status = usb_control_msg(usbdev, pipe, request, requesttype, value, + index, buf, 1, MOS_WDR_TIMEOUT); + if (status == 1) + *data = *buf; + else if (status < 0) dev_err(&usbdev->dev, "mos7720: usb_control_msg() failed: %d", status); + kfree(buf); + return status; } |