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USB: serial: ftdi_sio: fix latency-timer error handling

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commit e3e574ad85 upstream.

Make sure to detect short responses when reading the latency timer to
avoid using stale buffer data.

Note that no heap data would currently leak through sysfs as
ASYNC_LOW_LATENCY is set by default.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
2017-01-12 14:56:12 +01:00
committed by Greg Kroah-Hartman
parent 5890ca8333
commit f15ca928dc
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/serial/ftdi_sio.c
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@@ -1439,10 +1439,13 @@ static int read_latency_timer(struct usb_serial_port *port)
FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
0, priv->interface,
buf, 1, WDR_TIMEOUT);
if (rv < 0)
if (rv < 1) {
dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
else
if (rv >= 0)
rv = -EIO;
} else {
priv->latency = buf[0];
}
kfree(buf);