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KVM: x86: zero base3 of unusable segments

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commit f0367ee1d6 upstream.

Static checker noticed that base3 could be used uninitialized if the
segment was not present (useable).  Random stack values probably would
not pass VMCS entry checks.

Reported-by:  Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 1aa366163b ("KVM: x86 emulator: consolidate segment accessors")
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Radim Krčmář
2017-05-18 19:37:30 +02:00
committed by Greg Kroah-Hartman
parent 02800188d7
commit bde6903736
1 changed files with 2 additions and 0 deletions
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arch/x86/kvm/x86.c
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@@ -5098,6 +5098,8 @@ static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
if (var.unusable) {
memset(desc, 0, sizeof(*desc));
if (base3)
*base3 = 0;
return false;
}