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KVM: x86/xen: Fix cleanup logic in emulation of Xen schedop poll hypercalls

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commit 5a53249d14 upstream.

kvm_xen_schedop_poll does a kmalloc_array() when a VM polls the host
for more than one event channel potr (nr_ports > 1).

After the kmalloc_array(), the error paths need to go through the
"out" label, but the call to kvm_read_guest_virt() does not.

Fixes: 92c58965e9 ("KVM: x86/xen: Use kvm_read_guest_virt() instead of open-coding it badly")
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Manuel Andreas <manuel.andreas@tum.de>
[Adjusted commit message. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manuel Andreas 2025-07-23 17:51:20 +02:00 committed by Greg Kroah-Hartman
parent 48e8791843
commit 3ee59c38ae
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/xen.c
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@ -1260,7 +1260,7 @@ static bool kvm_xen_schedop_poll(struct kvm_vcpu *vcpu, bool longmode,
if (kvm_read_guest_virt(vcpu, (gva_t)sched_poll.ports, ports,
sched_poll.nr_ports * sizeof(*ports), &e)) {
*r = -EFAULT;
return true;
goto out;
}
for (i = 0; i < sched_poll.nr_ports; i++) {