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iommu/vt-d: Check if domain->pgd was allocated 

There is a couple of places where on domain_init() failure domain_exit()
is called. While currently domain_init() can fail only if
alloc_pgtable_page() has failed.

Make domain_exit() check if domain->pgd present, before calling
domain_unmap(), as it theoretically should crash on clearing pte entries
in dma_pte_clear_level().

Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: iommu@lists.linux-foundation.org
Signed-off-by: Dmitry Safonov <dima@arista.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Dmitry Safonov 2019-07-16 22:38:06 +01:00 committed by Joerg Roedel
parent effa467870
commit 3ee9eca760
1 changed files with 5 additions and 3 deletions
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6
drivers/iommu/intel-iommu.c
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@ -1890,7 +1890,6 @@ static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu,
static void domain_exit(struct dmar_domain *domain)
{
struct page *freelist;
/* Remove associated devices and clear attached or cached domains */
domain_remove_dev_info(domain);
@ -1898,9 +1897,12 @@ static void domain_exit(struct dmar_domain *domain)
/* destroy iovas */
put_iova_domain(&domain->iovad);
freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
if (domain->pgd) {
struct page *freelist;
freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
dma_free_pagelist(freelist);
}
free_domain_mem(domain);
}