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iommu/dma: Don't put uninitialised IOVA domains

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commit 3ec60043f7 upstream.

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")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Murphy
2016-08-09 16:23:17 +01:00
committed by Greg Kroah-Hartman
parent 433ccf1fb4
commit d360081c4b
1 changed files with 2 additions and 1 deletions
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drivers/iommu/dma-iommu.c
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@@ -68,6 +68,7 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
if (!iovad)
return;
if (iovad->granule)
put_iova_domain(iovad);
kfree(iovad);
domain->iova_cookie = NULL;