genirq/ipi: Fixup checks against nr_cpu_ids

Valid CPU ids are [0, nr_cpu_ids-1] inclusive. Fixes: 3b8e29a ("genirq: Implement ipi_send_mask/single()") Fixes: f9bce79 ("genirq: Add a new function to get IPI reverse mapping") Signed-off-by: Alexey Dobriyan <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/20170819095751.GB27864@avx2
penberg · Aug 20, 2017 · 8fbbe2d · 8fbbe2d
1 parent e8f2418
commit 8fbbe2d
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c
@@ -165,7 +165,7 @@ irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu)
 	struct irq_data *data = irq_get_irq_data(irq);
 	struct cpumask *ipimask = data ? irq_data_get_affinity_mask(data) : NULL;
 
-	if (!data || !ipimask || cpu > nr_cpu_ids)
+	if (!data || !ipimask || cpu >= nr_cpu_ids)
 		return INVALID_HWIRQ;
 
 	if (!cpumask_test_cpu(cpu, ipimask))
@@ -195,7 +195,7 @@ static int ipi_send_verify(struct irq_chip *chip, struct irq_data *data,
 	if (!chip->ipi_send_single && !chip->ipi_send_mask)
 		return -EINVAL;
 
-	if (cpu > nr_cpu_ids)
+	if (cpu >= nr_cpu_ids)
 		return -EINVAL;
 
 	if (dest) {