Commit 37b54408 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Christoffer Dall

arm/arm64: KVM: fix potential NULL dereference in user_mem_abort()

Handle the potential NULL return value of find_vma_intersection()
before dereferencing it.
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent e9e8578b
......@@ -776,6 +776,12 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
/* Let's check if we will get back a huge page backed by hugetlbfs */
down_read(&current->mm->mmap_sem);
vma = find_vma_intersection(current->mm, hva, hva + 1);
if (unlikely(!vma)) {
kvm_err("Failed to find VMA for hva 0x%lx\n", hva);
up_read(&current->mm->mmap_sem);
return -EFAULT;
}
if (is_vm_hugetlb_page(vma)) {
hugetlb = true;
gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT;
......
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