KVM: correct null pid check in kvm_vcpu_yield_to()

Correct a simple mistake of checking the wrong variable
before a dereference, resulting in the dereference not being
properly protected by rcu_dereference().

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 96ec6226e4ab61fd62ef418a0a92011c57129a59..95519bc959edcaaefe27d1fd9e1d7a51aa52b6e2 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1725,7 +1725,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target)
        rcu_read_lock();
        pid = rcu_dereference(target->pid);
        if (pid)
-               task = get_pid_task(target->pid, PIDTYPE_PID);
+               task = get_pid_task(pid, PIDTYPE_PID);
        rcu_read_unlock();
        if (!task)
                return ret;