diff --git a/include/linux/irq.h b/include/linux/irq.h
index 974890b..99d147e 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -482,6 +482,16 @@
 #endif
 }
 
+static inline void free_desc_masks(struct irq_desc *old_desc,
+				   struct irq_desc *new_desc)
+{
+	free_cpumask_var(old_desc->affinity);
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+	free_cpumask_var(old_desc->pending_mask);
+#endif
+}
+
 #else /* !CONFIG_SMP */
 
 static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
@@ -495,6 +505,10 @@
 {
 }
 
+static inline void free_desc_masks(struct irq_desc *old_desc,
+				   struct irq_desc *new_desc)
+{
+}
 #endif	/* CONFIG_SMP */
 
 #endif /* _LINUX_IRQ_H */
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 243d612..44bbdcb 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -54,6 +54,7 @@
 static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
 {
 	free_kstat_irqs(old_desc, desc);
+	free_desc_masks(old_desc, desc);
 	arch_free_chip_data(old_desc, desc);
 }