iommu: Check the result of iommu_group_get() for NULL
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Web: https://git.kernel.org/torvalds/c/9ae9df035c274c89b7fe3dbc74cbe2fa63386668 Commit: 9ae9df035c274c89b7fe3dbc74cbe2fa63386668 Parent: 1291a0d5049dbc06baaaf66a9ff3f53db493b19b Refname: refs/heads/master Author: Jordan Crouse <[email protected]> AuthorDate: Wed Dec 20 09:48:36 2017 -0700 Committer: Alex Williamson <[email protected]> CommitDate: Wed Dec 20 09:48:36 2017 -0700 iommu: Check the result of iommu_group_get() for NULL The result of iommu_group_get() was being blindly used in both attach and detach which results in a dereference when trying to work with an unknown device. Signed-off-by: Jordan Crouse <[email protected]> Signed-off-by: Alex Williamson <[email protected]> --- drivers/iommu/iommu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3de5c0bcb5cc..69fef991c651 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1303,6 +1303,9 @@ int iommu_attach_device(struct iommu_domain *domain, struct device *dev) int ret; group = iommu_group_get(dev); + if (!group) + return -ENODEV; + /* * Lock the group to make sure the device-count doesn't * change while we are attaching @@ -1341,6 +1344,8 @@ void iommu_detach_device(struct iommu_domain *domain, struct device *dev) struct iommu_group *group; group = iommu_group_get(dev); + if (!group) + return; mutex_lock(&group->mutex); if (iommu_group_device_count(group) != 1) { -- To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html