xen/events: prevent calling evtchn_get on invalid channels
The event channel number provided to evtchn_get can be provided by userspace, so needs to be checked against the maximum number of event channels prior to using it to index into evtchn_to_irq. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -1104,6 +1104,9 @@ int evtchn_get(unsigned int evtchn)
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struct irq_info *info;
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int err = -ENOENT;
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if (evtchn >= NR_EVENT_CHANNELS)
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return -EINVAL;
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mutex_lock(&irq_mapping_update_lock);
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irq = evtchn_to_irq[evtchn];
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