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| author |   Wei Yongjun <weiyongjun1@huawei.com> | 2018-05-07 01:40:34 +0000 |
|---|---|---|
| committer |   Vinod Koul <vkoul@kernel.org> | 2018-05-07 13:31:32 +0530 |
| commit | e891e41ee301a57fc74a4a0d4da60fdc9669e50c (patch) | |
| tree | e783ee2f7cd1c5a4617e339c195813da3ecb1595 /drivers/dma/sprd-dma.c | |
| parent | dmaengine: sprd: Move DMA request mode and interrupt type into head file (diff) | |
| download | linux-dev-e891e41ee301a57fc74a4a0d4da60fdc9669e50c.tar.xz linux-dev-e891e41ee301a57fc74a4a0d4da60fdc9669e50c.zip | |
dmaengine: sprd: Fix potential NULL dereference in sprd_dma_probe()
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@huawei.com>
Reviewed-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/sprd-dma.c')
| -rw-r--r-- | drivers/dma/sprd-dma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c index ccdeb8f999e5..dba7a17dee15 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) |