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KVM: x86: masking out upper bits

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kvm_read_cr3() returns an unsigned long and gfn is a u64.  We intended
to mask out the bottom 5 bits but because of the type issue we mask the
top 32 bits as well.  I don't know if this is a real problem, but it
causes static checker warnings.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Dan Carpenter 2017-07-17 11:14:26 +03:00 • committed by Radim Krčmář
commit f85c758dbe
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/x86.c
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@ -597,8 +597,8 @@ bool pdptrs_changed(struct kvm_vcpu *vcpu)
(unsigned long *)&vcpu->arch.regs_avail))
return true;
gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
gfn = (kvm_read_cr3(vcpu) & ~31ul) >> PAGE_SHIFT;
offset = (kvm_read_cr3(vcpu) & ~31ul) & (PAGE_SIZE - 1);
r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
PFERR_USER_MASK | PFERR_WRITE_MASK);
if (r < 0)