From d5afce82e131eb5a171afeba0bc5fefbe2417ad9 Mon Sep 17 00:00:00 2001 From: Rickard Strandqvist Date: Fri, 16 May 2014 17:39:13 +0200 Subject: [PATCH] USB: keyspan: fix potential null pointer dereference Move control-urb dereference to after NULL-check. There is otherwise a risk of a possible null pointer dereference. Was largely found by using a static code analysis program called cppcheck. [Johan: modify commit message somewhat ] [gkh: remove stable tag as it's not a real problem that anyone has ever hit] Signed-off-by: Rickard Strandqvist Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/keyspan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c index d3acaead5a81..93cb7cebda62 100644 --- a/drivers/usb/serial/keyspan.c +++ b/drivers/usb/serial/keyspan.c @@ -1535,14 +1535,14 @@ static int keyspan_usa26_send_setup(struct usb_serial *serial, this_urb = p_priv->outcont_urb; - dev_dbg(&port->dev, "%s - endpoint %d\n", __func__, usb_pipeendpoint(this_urb->pipe)); - /* Make sure we have an urb then send the message */ if (this_urb == NULL) { dev_dbg(&port->dev, "%s - oops no urb.\n", __func__); return -1; } + dev_dbg(&port->dev, "%s - endpoint %d\n", __func__, usb_pipeendpoint(this_urb->pipe)); + /* Save reset port val for resend. Don't overwrite resend for open/close condition. */ if ((reset_port + 1) > p_priv->resend_cont) -- 2.20.1