diff --git a/kernel/sched.c b/kernel/sched.c
index a3dff1f3f9b0..6af210a7de70 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4903,7 +4903,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
 	int ret;
 	cpumask_var_t mask;
 
-	if (len < nr_cpu_ids)
+	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
 		return -EINVAL;
 	if (len & (sizeof(unsigned long)-1))
 		return -EINVAL;