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

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commit e3e574ad85a208cb179f33720bb5f12b453de33c 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: 1da177e4c3f4 ("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 ca4e6525df
commit 594c9b4b0a
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);