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iommu: Check dev->iommu in dev_iommu_priv_get() before dereferencing it 

The dev_iommu_priv_get() needs a similar check to
dev_iommu_fwspec_get() to make sure no NULL-ptr is dereferenced.

Fixes: 05a0542b45 ("iommu/amd: Store dev_data as device iommu private data")
Cc: stable@vger.kernel.org	# v5.8+
Link: https://lore.kernel.org/r/20210202145419.29143-1-joro@8bytes.org
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=211241
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2021-02-02 15:54:19 +01:00
parent 1048ba83fb
commit 4c9fb5d914
1 changed files with 4 additions and 1 deletions
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5
include/linux/iommu.h
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@ -616,7 +616,10 @@ static inline void dev_iommu_fwspec_set(struct device *dev,
static inline void *dev_iommu_priv_get(struct device *dev)
{
return dev->iommu->priv;
if (dev->iommu)
return dev->iommu->priv;
else
return NULL;
}
static inline void dev_iommu_priv_set(struct device *dev, void *priv)