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")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/ftdi_sio.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 6dee20fc7e45..b064fad8e3ee 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -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);
--
2.10.2
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