renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-27 22:53:55 +08:00
Code

iommu/virtio: Fix freeing of incomplete domains

Browse Source 
Calling viommu_domain_free() on a domain that hasn't been finalised (not
attached to any device, for example) can currently cause an Oops,
because we attempt to call ida_free() on ID 0, which may either be
unallocated or used by another domain.

Only initialise the vdomain->viommu pointer, which denotes a finalised
domain, at the end of a successful viommu_domain_finalise().

Fixes: edcd69ab9a ("iommu: Add virtio-iommu driver")
Reported-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20200326093558.2641019-3-jean-philippe@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jean-Philippe Brucker 2020-03-26 10:35:57 +01:00 committed by Joerg Roedel
parent 3f84b96c97
commit 7062af3ed2
1 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/iommu/virtio-iommu.c
View File

@ -613,18 +613,20 @@ static int viommu_domain_finalise(struct viommu_dev *viommu,
int ret;
struct viommu_domain *vdomain = to_viommu_domain(domain);
vdomain->viommu = viommu;
vdomain->map_flags = viommu->map_flags;
ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
viommu->last_domain, GFP_KERNEL);
if (ret < 0)
return ret;
vdomain->id = (unsigned int)ret;
domain->pgsize_bitmap = viommu->pgsize_bitmap;
domain->geometry = viommu->geometry;
ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
viommu->last_domain, GFP_KERNEL);
if (ret >= 0)
vdomain->id = (unsigned int)ret;
vdomain->map_flags = viommu->map_flags;
vdomain->viommu = viommu;
return ret > 0 ? 0 : ret;
return 0;
}
static void viommu_domain_free(struct iommu_domain *domain)