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From: Nicholas Mc Guire <hofrat@osadl.org>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>,
	Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	Joe Perches <joe@perches.com>,
	linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
	linux-kernel@vger.kernel.org,
	Nicholas Mc Guire <hofrat@osadl.org>
Subject: [PATCH V2] staging: iio: adc: ad7280a: check for devm_kasprint() failure
Date: Tue, 27 Nov 2018 18:05:04 +0100	[thread overview]
Message-ID: <1543338304-892-1-git-send-email-hofrat@osadl.org> (raw)

devm_kasprintf() may return NULL on failure of internal allocation thus
the assignments to  attr.name  are not safe if not checked. On error
ad7280_attr_init() returns a negative return so -ENOMEM should be
OK here (passed on as return value of the probe function). To make the
error case more readable a temporary  iio_attr  is introduced and the code
refactored.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: 2051f25d2a26 ("iio: adc: New driver for AD7280A Lithium Ion Battery Monitoring System2")
---

V2: use a tmp pointer to iio_attr to make the error check more readable
    as proposed by Dan Carpenter <dan.carpenter@oracle.com>

Problem located with an experimental coccinelle script

Patch was compile tested with: x86_64_defconfig + STAGING=y
SPI=y, IIO=y, AD7280=m

Patch is against 4.20-rc4 (localversion-next is next-20181127)

 drivers/staging/iio/adc/ad7280a.c | 43 +++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index 0bb9ab1..7a0ba26 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -561,6 +561,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
 {
 	int dev, ch, cnt;
 	unsigned int index;
+	struct iio_dev_attr *iio_attr;
 
 	st->iio_attr = devm_kcalloc(&st->spi->dev, 2, sizeof(*st->iio_attr) *
 				    (st->slave_num + 1) * AD7280A_CELLS_PER_DEV,
@@ -571,37 +572,35 @@ static int ad7280_attr_init(struct ad7280_state *st)
 	for (dev = 0, cnt = 0; dev <= st->slave_num; dev++)
 		for (ch = AD7280A_CELL_VOLTAGE_1; ch <= AD7280A_CELL_VOLTAGE_6;
 			ch++, cnt++) {
+			iio_attr = &st->iio_attr[cnt];
 			index = dev * AD7280A_CELLS_PER_DEV + ch;
-			st->iio_attr[cnt].address =
-				ad7280a_devaddr(dev) << 8 | ch;
-			st->iio_attr[cnt].dev_attr.attr.mode =
-				0644;
-			st->iio_attr[cnt].dev_attr.show =
-				ad7280_show_balance_sw;
-			st->iio_attr[cnt].dev_attr.store =
-				ad7280_store_balance_sw;
-			st->iio_attr[cnt].dev_attr.attr.name =
+			iio_attr->address = ad7280a_devaddr(dev) << 8 | ch;
+			iio_attr->dev_attr.attr.mode = 0644;
+			iio_attr->dev_attr.show = ad7280_show_balance_sw;
+			iio_attr->dev_attr.store = ad7280_store_balance_sw;
+			iio_attr->dev_attr.attr.name =
 				devm_kasprintf(&st->spi->dev, GFP_KERNEL,
 					       "in%d-in%d_balance_switch_en",
 					       index, index + 1);
-			ad7280_attributes[cnt] =
-				&st->iio_attr[cnt].dev_attr.attr;
+			if (!iio_attr->dev_attr.attr.name)
+				return -ENOMEM;
+
+			ad7280_attributes[cnt] = &iio_attr->dev_attr.attr;
 			cnt++;
-			st->iio_attr[cnt].address =
-				ad7280a_devaddr(dev) << 8 |
+			iio_attr = &st->iio_attr[cnt];
+			iio_attr->address = ad7280a_devaddr(dev) << 8 |
 				(AD7280A_CB1_TIMER + ch);
-			st->iio_attr[cnt].dev_attr.attr.mode =
-				0644;
-			st->iio_attr[cnt].dev_attr.show =
-				ad7280_show_balance_timer;
-			st->iio_attr[cnt].dev_attr.store =
-				ad7280_store_balance_timer;
-			st->iio_attr[cnt].dev_attr.attr.name =
+			iio_attr->dev_attr.attr.mode = 0644;
+			iio_attr->dev_attr.show = ad7280_show_balance_timer;
+			iio_attr->dev_attr.store = ad7280_store_balance_timer;
+			iio_attr->dev_attr.attr.name =
 				devm_kasprintf(&st->spi->dev, GFP_KERNEL,
 					       "in%d-in%d_balance_timer",
 					       index, index + 1);
-			ad7280_attributes[cnt] =
-				&st->iio_attr[cnt].dev_attr.attr;
+			if (!iio_attr->dev_attr.attr.name)
+				return -ENOMEM;
+
+			ad7280_attributes[cnt] = &iio_attr->dev_attr.attr;
 		}
 
 	ad7280_attributes[cnt] = NULL;
-- 
2.1.4

             reply	other threads:[~2018-11-28  4:09 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-27 17:05 Nicholas Mc Guire [this message]
2018-12-01 16:35 ` [PATCH V2] staging: iio: adc: ad7280a: check for devm_kasprint() failure Jonathan Cameron

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