linux-kernel - [PATCH 3.5 07/96] staging: comedi: pcmuio: fix possible NULL deref on detach

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Message-Id: <1389623099-18783-8-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 13 Jan 2014 14:23:30 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ian Abbott <abbotti@....co.uk>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.5 07/96] staging: comedi: pcmuio: fix possible NULL deref on detach

3.5.7.29 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ian Abbott <abbotti@....co.uk>

commit 2fd2bdfccae61efe18f6b92b6a45fbf936d75b48 upstream.

pcmuio_detach() is called by the comedi core even if pcmuio_attach()
returned an error, so `dev->private` might be `NULL`.  Check for that
before dereferencing it.

Also, as pointed out by Dan Carpenter, there is no need to check the
pointer passed to `kfree()` is non-NULL, so remove that check.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
Cc: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[ Ian: Applies to 3.5.y only ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/staging/comedi/drivers/pcmuio.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/comedi/drivers/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c
index 623381d..d49c873 100644
--- a/drivers/staging/comedi/drivers/pcmuio.c
+++ b/drivers/staging/comedi/drivers/pcmuio.c
@@ -914,12 +914,13 @@ static void pcmuio_detach(struct comedi_device *dev)
 
 	if (dev->iobase)
 		release_region(dev->iobase, ASIC_IOSIZE * thisboard->num_asics);
-	for (i = 0; i < MAX_ASICS; ++i) {
-		if (devpriv->asics[i].irq)
-			free_irq(devpriv->asics[i].irq, dev);
-	}
-	if (devpriv && devpriv->sprivs)
+	if (devpriv) {
+		for (i = 0; i < MAX_ASICS; ++i) {
+			if (devpriv->asics[i].irq)
+				free_irq(devpriv->asics[i].irq, dev);
+		}
 		kfree(devpriv->sprivs);
+	}
 }
 
 static const struct pcmuio_board pcmuio_boards[] = {
-- 
1.8.3.2

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