[PATCH -next] iommu/arm-smmu: fix potential NULL pointer dereference in arm_smmu_map()
Will Deacon
will.deacon at arm.com
Fri Nov 15 07:53:16 EST 2013
On Fri, Nov 15, 2013 at 09:45:03AM +0000, Wei Yongjun wrote:
> From: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
>
> The dereference should be moved below the NULL test.
>
> Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
> ---
> drivers/iommu/arm-smmu.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 2349d62..a0cc0a5 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1420,9 +1420,8 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
> phys_addr_t paddr, size_t size, int flags)
> {
> struct arm_smmu_domain *smmu_domain = domain->priv;
> - struct arm_smmu_device *smmu = smmu_domain->leaf_smmu;
>
> - if (!smmu_domain || !smmu)
> + if (!smmu_domain || !smmu_domain->leaf_smmu)
> return -ENODEV;
>
> /* Check for silent address truncation up the SMMU chain. */
I already have a patch for this, but actually, we can remove that check
altogether. I'll fix it in my tree.
Will
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