From: Joerg Roedel jroedel@suse.de
commit 4c9fb5d9140802db4db9f66c23887f43174e113c upstream.
The dev_iommu_priv_get() needs a similar check to dev_iommu_fwspec_get() to make sure no NULL-ptr is dereferenced.
Fixes: 05a0542b456e1 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/iommu.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -614,7 +614,10 @@ static inline void dev_iommu_fwspec_set(
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)