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| author |   Kees Bakker <kees@ijzerbout.nl> | 2025-01-07 10:17:42 +0800 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2025-01-07 09:30:50 +0100 |
| commit | 60f030f7418d3f1d94f2fb207fe3080e1844630b (patch) | |
| tree | f470900f5d2aa225eb342fabb7c528300dda1f95 | |
| parent | Linux 6.13-rc3 (diff) | |
| download | wireguard-linux-60f030f7418d3f1d94f2fb207fe3080e1844630b.tar.xz wireguard-linux-60f030f7418d3f1d94f2fb207fe3080e1844630b.zip | |
iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE
There is a WARN_ON_ONCE to catch an unlikely situation when
domain_remove_dev_pasid can't find the `pasid`. In case it nevertheless
happens we must avoid using a NULL pointer.
Signed-off-by: Kees Bakker <kees@ijzerbout.nl>
Link: https://lore.kernel.org/r/20241218201048.E544818E57E@bout3.ijzerbout.nl
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 79e0da9eb626..8f75c11a3ec4 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4090,13 +4090,14 @@ void domain_remove_dev_pasid(struct iommu_domain *domain, break; } } - WARN_ON_ONCE(!dev_pasid); spin_unlock_irqrestore(&dmar_domain->lock, flags); cache_tag_unassign_domain(dmar_domain, dev, pasid); domain_detach_iommu(dmar_domain, iommu); - intel_iommu_debugfs_remove_dev_pasid(dev_pasid); - kfree(dev_pasid); + if (!WARN_ON_ONCE(!dev_pasid)) { + intel_iommu_debugfs_remove_dev_pasid(dev_pasid); + kfree(dev_pasid); + } } static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid, |