Messages in this thread Patch in this message | | | From | Baoquan He <> | Subject | [PATCH] iommu/amd: Check if domain is NULL before dereference it | Date | Thu, 24 Aug 2017 19:56:47 +0800 |
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In get_domain(), 'domain' could still be NULL before it's passed to dma_ops_domain() to dereference. For safety, check if 'domain' is NULL before passing to dma_ops_domain().
Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Baoquan He <bhe@redhat.com> --- drivers/iommu/amd_iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 16f1e6af00b0..2e2d5e6a13b3 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2262,7 +2262,7 @@ static struct protection_domain *get_domain(struct device *dev) domain = to_pdomain(io_domain); attach_device(dev, domain); } - if (!dma_ops_domain(domain)) + if (domain && !dma_ops_domain(domain)) return ERR_PTR(-EBUSY); return domain; -- 2.5.5
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