linux-kernel - [PATCH 3.13 51/99] staging:iio:impedance:ad5933: correct error check

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Message-Id: <20140220235119.687119266@linuxfoundation.org>
Date:	Thu, 20 Feb 2014 15:52:46 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
	Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 3.13 51/99] staging:iio:impedance:ad5933: correct error check

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

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

From: Julia Lawall <Julia.Lawall@...6.fr>

commit e9ed104de68c345c9a827225e93c74c6894613a9 upstream.

iio_kfifo_allocate returns NULL in case of error.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression *x;
identifier f;
statement S1,S2;
@@

*x = f(...);
 if (x) { <+... when != if (...) S1 else S2
     -ENOMEM ...+> }
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/iio/impedance-analyzer/ad5933.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -629,7 +629,7 @@ static int ad5933_register_ring_funcs_an
 	struct iio_buffer *buffer;
 
 	buffer = iio_kfifo_allocate(indio_dev);
-	if (buffer)
+	if (!buffer)
 		return -ENOMEM;
 
 	iio_device_attach_buffer(indio_dev, buffer);


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