[Xen-devel] [PATCH] linux/x86: fix off-by-one error in the pirq range checks

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

As usual, written and tested on 2.6.27.x and made apply to the 2.6.18
tree without further testing.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- sle11-2009-02-16.orig/arch/i386/kernel/io_apic-xen.c        2009-02-16 
17:04:32.000000000 +0100
+++ sle11-2009-02-16/arch/i386/kernel/io_apic-xen.c     2009-02-16 
17:05:52.000000000 +0100
@@ -1233,7 +1233,7 @@ static int __assign_irq_vector(int irq)
 
        BUG_ON(irq != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS);
 
-       if (irq < PIRQ_BASE || irq - PIRQ_BASE > NR_PIRQS)
+       if (irq < PIRQ_BASE || irq - PIRQ_BASE >= NR_PIRQS)
                return -EINVAL;
 
        spin_lock_irqsave(&vector_lock, flags);
--- sle11-2009-02-16.orig/arch/x86_64/kernel/io_apic-xen.c      2009-02-16 
17:04:32.000000000 +0100
+++ sle11-2009-02-16/arch/x86_64/kernel/io_apic-xen.c   2009-02-16 
17:05:52.000000000 +0100
@@ -858,7 +858,7 @@ static int __assign_irq_vector(int irq, 
   
        BUG_ON(irq != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS);
 
-       if (irq < PIRQ_BASE || irq - PIRQ_BASE > NR_PIRQS)
+       if (irq < PIRQ_BASE || irq - PIRQ_BASE >= NR_PIRQS)
                return -EINVAL;
 
        spin_lock_irqsave(&vector_lock, flags);




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