Hi Yongjun,
On 7 May 2018 at 09:40, Wei Yongjun <weiyongjun1@xxxxxxxxxx> wrote:
> 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>
Thanks for fixing my mistake.
Reviewed-by: Baolin Wang <baolin.wang@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)
>
--
Baolin.wang
Best Regards
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