linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Valentina Manea <valentina.manea.m@gmail.com>,
	Shuah Khan <shuah@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: [PATCH] usbip: vudc: check for NULL before use
Date: Sun, 18 Dec 2016 22:44:51 +0000	[thread overview]
Message-ID: <1482101091-3969-1-git-send-email-sudipm.mukherjee@gmail.com> (raw)

to_vep() is doing a container_of() on _ep. It is better to do the NULL
check first and then use it.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
---
 drivers/usb/usbip/vudc_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/usbip/vudc_dev.c b/drivers/usb/usbip/vudc_dev.c
index 968471b..32ea604 100644
--- a/drivers/usb/usbip/vudc_dev.c
+++ b/drivers/usb/usbip/vudc_dev.c
@@ -388,10 +388,10 @@ static int vep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 	unsigned long flags;
 	int ret = 0;
 
-	ep = to_vep(_ep);
 	if (!_ep)
 		return -EINVAL;
 
+	ep = to_vep(_ep);
 	udc = ep_to_vudc(ep);
 	if (!udc->driver)
 		return -ESHUTDOWN;
-- 
1.9.1

             reply	other threads:[~2016-12-18 22:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-18 22:44 Sudip Mukherjee [this message]
2016-12-20 14:31 ` Shuah Khan
2016-12-21 13:33   ` Sudip Mukherjee
2016-12-21 14:38     ` Shuah Khan
2016-12-21 15:02       ` Krzysztof Opasiak
2016-12-21 16:11       ` Sudip Mukherjee

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1482101091-3969-1-git-send-email-sudipm.mukherjee@gmail.com \
    --to=sudipm.mukherjee@gmail.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=shuah@kernel.org \
    --cc=valentina.manea.m@gmail.com \
    --subject='Re: [PATCH] usbip: vudc: check for NULL before use' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).