iommu: Fix NULL group->domain dereference in pci_dev_reset_iommu_done()

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Local sashiko review pointed it out that group->domain could be NULL when
a default domain fails to allocate during the first probe, which can crash
at domain->ops->attach_dev dereference in __iommu_attach_device() invoked
by pci_dev_reset_iommu_done().

pci_dev_reset_iommu_prepare() is fine as an old_domain pointer can be NULL.

Skip the re-attach in pci_dev_reset_iommu_done() to fix the bug.

Fixes: c279e83953 ("iommu: Introduce pci_dev_reset_iommu_prepare/done()")
Cc: stable@vger.kernel.org
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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Nicolin Chen 2026-04-24 18:15:20 -07:00 • committed by Joerg Roedel

parent 07d0f496fe

commit d769711fcd

1 changed files with 7 additions and 2 deletions

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drivers/iommu/iommu.c

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