platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference
a bit later in the code.
This is detected by Coccinelle semantic patch.
@@
expression pdev, res, n, t, e, e1, e2;
@@
res = platform_get_resource(pdev, t, n);
+ if (!res)
+ return -EINVAL;
... when != res == NULL
e = devm_ioremap_nocache(e1, res->start, e2);
Fixes: 9b3b8171f7f4 ("dmaengine: sprd: Add Spreadtrum DMA driver")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
drivers/dma/sprd-dma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index ccdeb8f..dba7a17 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -807,6 +807,8 @@ static int sprd_dma_probe(struct platform_device *pdev)
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
sdev->glb_base = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (!sdev->glb_base)
--
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