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ASoC: sirf: Fix potential NULL pointer dereference 

There is a potential execution path in which function
platform_get_resource() returns NULL. If this happens,
we will end up having a NULL pointer dereference.

Fix this by replacing devm_ioremap with devm_ioremap_resource,
which has the NULL check and the memory region request.

This code was detected with the help of Coccinelle.

Cc: stable@vger.kernel.org
Fixes: 2bd8d1d5cf ("ASoC: sirf: Add audio usp interface driver")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2018-07-26 15:49:10 -05:00 committed by Mark Brown
parent 4321723648
commit ae1c696a48
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GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 4 deletions
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7
sound/soc/sirf/sirf-usp.c
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@ -370,10 +370,9 @@ static int sirf_usp_pcm_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, usp);
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap(&pdev->dev, mem_res->start,
resource_size(mem_res));
if (base == NULL)
return -ENOMEM;
base = devm_ioremap_resource(&pdev->dev, mem_res);
if (IS_ERR(base))
return PTR_ERR(base);
usp->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sirf_usp_regmap_config);
if (IS_ERR(usp->regmap))