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@xxxxxxxxxxxxxxx
Fixes: 2bd8d1d5cf89 ("ASoC: sirf: Add audio usp interface driver")
Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
---
sound/soc/sirf/sirf-usp.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/sound/soc/sirf/sirf-usp.c b/sound/soc/sirf/sirf-usp.c
index 77e7dcf..d70fcd4 100644
--- a/sound/soc/sirf/sirf-usp.c
+++ b/sound/soc/sirf/sirf-usp.c
@@ -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))
--
2.7.4
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