x86: Check for valid pirq values in hvm_domain_use_pirq

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index d6447c778e0e157aeb9628de73e8020e78bfbcec..43aa1a956870f6b157721baec1eac81b98043b7c 100644 (file)
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -1955,7 +1955,7 @@ int hvm_domain_use_pirq(struct domain *d, int pirq)
 {
     int emuirq;
     
-    if ( !is_hvm_domain(d) )
+    if ( !is_hvm_domain(d) || pirq < 0 )
         return 0;
 
     emuirq = domain_pirq_to_emuirq(d, pirq);