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Commit 1cf38741 authored by Juergen Gross's avatar Juergen Gross Committed by David Vrabel
Browse files

x86/xen: fix upper bound of pmd loop in xen_cleanhighmap() 



xen_cleanhighmap() is operating on level2_kernel_pgt only. The upper
bound of the loop setting non-kernel-image entries to zero should not
exceed the size of level2_kernel_pgt.

Reported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 842775f1

arch/x86/xen/mmu.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -1113,7 +1113,7 @@ static void __init xen_cleanhighmap(unsigned long vaddr, 




	/* NOTE: The loop is more greedy than the cleanup_highmap variant.

	/* NOTE: The loop is more greedy than the cleanup_highmap variant.

	 * We include the PMD passed in on _both_ boundaries. */

	 * We include the PMD passed in on _both_ boundaries. */

	for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PAGE_SIZE));

	for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));

			pmd++, vaddr += PMD_SIZE) {

			pmd++, vaddr += PMD_SIZE) {

		if (pmd_none(*pmd))

		if (pmd_none(*pmd))

			continue;

			continue;