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IOMMU Fix for Linux v5.11-rc6

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- Fix a possible NULL-ptr dereference in dev_iommu_priv_get()
 	  which is too easy to accidentially trigger from IOMMU drivers.
 	  In the current case the AMD IOMMU driver triggered it on some
 	  machines in the IO-page-fault path, so fix it once and for
 	  all.
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Merge tag 'iommu-fixes-v5.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU fix from Joerg Roedel:
 "Fix a possible NULL-ptr dereference in dev_iommu_priv_get() which is
  too easy to accidentially trigger from IOMMU drivers.

  In the current case the AMD IOMMU driver triggered it on some machines
  in the IO-page-fault path, so fix it once and for all"

* tag 'iommu-fixes-v5.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu: Check dev->iommu in dev_iommu_priv_get() before dereferencing it
This commit is contained in:
Linus Torvalds 2021-02-05 09:57:29 -08:00
commit 97ba0c7413
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)