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Commit 63eaa75e authored by Maurizio Lombardi's avatar Maurizio Lombardi Committed by Joerg Roedel
Browse files

amd_iommu: do not dereference a NULL pointer address. 



under low memory conditions, alloc_pte() may return a NULL pointer.
iommu_map_page() does not check it and will panic the system.

Signed-off-by: default avatarMaurizio Lombardi <mlombard@redhat.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent cafd2545

drivers/iommu/amd_iommu.c

+3 −0
Original line number Diff line number Diff line
@@ -1393,6 +1393,9 @@ static int iommu_map_page(struct protection_domain *dom, 
	count     = PAGE_SIZE_PTE_COUNT(page_size);

	pte       = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL);



	if (!pte)

		return -ENOMEM;



	for (i = 0; i < count; ++i)

		if (IOMMU_PTE_PRESENT(pte[i]))

			return -EBUSY;