Fix broken modem-status error handling which could lead to bits of slab data leaking to user space.
Fixes: 3b36a8fd6777 ("usb: fix uninitialized variable warning in keyspan_pda") Cc: stable stable@vger.kernel.org # 2.6.27 Cc: Benny Halevy bhalevy@panasas.com Signed-off-by: Johan Hovold johan@kernel.org --- drivers/usb/serial/keyspan_pda.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c index 5169624d8b11..38d43c4b7ce5 100644 --- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -369,8 +369,10 @@ static int keyspan_pda_get_modem_info(struct usb_serial *serial, 3, /* get pins */ USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_IN, 0, 0, data, 1, 2000); - if (rc >= 0) + if (rc == 1) *value = *data; + else if (rc >= 0) + rc = -EIO;
kfree(data); return rc;