linux-kernel - [PATCH] Fix for possible null pointer dereference in keyspan.c

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Message-Id: <1400190910-28019-1-git-send-email-rickard_strandqvist@spectrumdigital.se>
Date:	Thu, 15 May 2014 23:55:10 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Johan Hovold <jhovold@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Fix for possible null pointer dereference in keyspan.c

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/usb/serial/keyspan.c |    4 ++--
 1 fil ändrad, 2 tillägg(+), 2 borttagningar(-)

diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index d3acaea..93cb7ce 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)
-- 
1.7.10.4

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