linux-kernel - [PATCH] staging: comedi: drivers: fix for a potential NULL pointer dereference

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Date:	Wed, 26 Feb 2014 01:04:45 +0200
From:	Kumar Amit Mehta <gmate.amit@...il.com>
To:	abbotti@....co.uk
Cc:	hsweeten@...ionengravers.com, gregkh@...uxfoundation.org,
	chase.southwood@...oo.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] staging: comedi: drivers: fix for a potential NULL pointer dereference

Return -ENOMEM in ni_E_init if ni_gpct_device_construct returns NULL

Signed-off-by: Kumar Amit Mehta <gmate.amit@...il.com>
---
 drivers/staging/comedi/drivers/ni_mio_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index 8adb535..3a86d48 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -4407,6 +4407,9 @@ static int ni_E_init(struct comedi_device *dev)
 							&ni_gpct_read_register,
 							counter_variant,
 							NUM_GPCT);
+	if (!devpriv->counter_dev)
+		return -ENOMEM;
+
 	/* General purpose counters */
 	for (j = 0; j < NUM_GPCT; ++j) {
 		s = &dev->subdevices[NI_GPCT_SUBDEV(j)];
-- 
1.8.5.3

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