linux-kernel - [PATCH 1/4] ASoC: imx-pcm-dma: add NULL test

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Date:	Sun, 20 Dec 2015 12:15:50 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Timur Tabi <timur@...i.org>
Cc:	kernel-janitors@...r.kernel.org,
	Nicolin Chen <nicoleotsuka@...il.com>,
	Xiubo Li <Xiubo.Lee@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] ASoC: imx-pcm-dma: add NULL test

Add NULL test on call to devm_kzalloc.

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

// <smpl>
@@
expression x;
@@

* x = devm_kzalloc(...);
  ... when != x == NULL
  *x
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 sound/soc/fsl/imx-pcm-dma.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/fsl/imx-pcm-dma.c b/sound/soc/fsl/imx-pcm-dma.c
index 1fc01ed..f3d3d1f 100644
--- a/sound/soc/fsl/imx-pcm-dma.c
+++ b/sound/soc/fsl/imx-pcm-dma.c
@@ -62,6 +62,8 @@ int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
 
 	config = devm_kzalloc(&pdev->dev,
 			sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
+	if (!config)
+		return -ENOMEM;
 	*config = imx_dmaengine_pcm_config;
 	if (size)
 		config->prealloc_buffer_size = size;

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