1 files changed, 2 insertions, 1 deletions

diff --git a/arch/m32r/kernel/smp.c b/arch/m32r/kernel/smp.c
index 1b7598e6f6e8..31cef20b2996 100644
--- a/arch/m32r/kernel/smp.c
+++ b/arch/m32r/kernel/smp.c
@@ -17,6 +17,7 @@
 
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <linux/sched.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
@@ -805,7 +806,7 @@ unsigned long send_IPI_mask_phys(cpumask_t physid_mask, int ipi_num,
 
         if (mask & ~physids_coerce(phys_cpu_present_map))
                 BUG();
-        if (ipi_num >= NR_IPIS)
+        if (ipi_num >= NR_IPIS || ipi_num < 0)
                 BUG();
 
         mask <<= IPI_SHIFT;