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iommu/dma: Don't put uninitialised IOVA domains

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Due to the limitations of having to wait until we see a device's DMA
restrictions before we know how we want an IOVA domain initialised,
there is a window for error if a DMA ops domain is allocated but later
freed without ever being used. In that case, init_iova_domain() was
never called, so calling put_iova_domain() from iommu_put_dma_cookie()
ends up trying to take an uninitialised lock and crashing.

Make things robust by skipping the call unless the IOVA domain actually
has been initialised, as we probably should have done from the start.

Fixes: 0db2e5d18f ("iommu: Implement common IOMMU ops for DMA mapping")
Cc: stable@vger.kernel.org
Reported-by: Nate Watterson <nwatters@codeaurora.org>
Reviewed-by: Nate Watterson <nwatters@codeaurora.org>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2016-08-09 16:23:17 +01:00 committed by Joerg Roedel
parent 9a8a5dcf20
commit 3ec60043f7
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/dma-iommu.c
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@ -68,7 +68,8 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
if (!iovad)
return;
put_iova_domain(iovad);
if (iovad->granule)
put_iova_domain(iovad);
kfree(iovad);
domain->iova_cookie = NULL;
}