linux-kernel - [RFT PATCH 1/2] ASoC: zx: i2s: Fix devm_ioremap

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Date:	Thu,  9 Jul 2015 22:19:28 +0900
From:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>
To:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Jun Nie <jun.nie@...aro.org>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Cc:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>,
	<stable@...r.kernel.org>
Subject: [RFT PATCH 1/2] ASoC: zx: i2s: Fix devm_ioremap_resource return value check

Value returned by devm_ioremap_resource() was checked for non-NULL but
devm_ioremap_resource() returns IOMEM_ERR_PTR, not NULL. In case of
error this could lead to dereference of ERR_PTR.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
Cc: <stable@...r.kernel.org>
Fixes: e5d4cd87800c ("ASoC: zx: Add ZTE zx296702 I2S DAI driver")

---

Patch only compile tested.
---
 sound/soc/zte/zx296702-i2s.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/zte/zx296702-i2s.c b/sound/soc/zte/zx296702-i2s.c
index 98d96e1b17e0..1930c42e1f55 100644
--- a/sound/soc/zte/zx296702-i2s.c
+++ b/sound/soc/zte/zx296702-i2s.c
@@ -393,9 +393,9 @@ static int zx_i2s_probe(struct platform_device *pdev)
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	zx_i2s->mapbase = res->start;
 	zx_i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (!zx_i2s->reg_base) {
+	if (IS_ERR(zx_i2s->reg_base)) {
 		dev_err(&pdev->dev, "ioremap failed!\n");
-		return -EIO;
+		return PTR_ERR(zx_i2s->reg_base);
 	}
 
 	writel_relaxed(0, zx_i2s->reg_base + ZX_I2S_FIFO_CTRL);
-- 
2.1.4

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