diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c
index 97365a863519..1310526b0d49 100644
--- a/drivers/media/dvb-core/dvb_ca_en50221.c
+++ b/drivers/media/dvb-core/dvb_ca_en50221.c
@@ -31,6 +31,7 @@
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/nospec.h>
 #include <linux/vmalloc.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
@@ -1476,6 +1477,7 @@ static ssize_t dvb_ca_en50221_io_write(struct file *file,
 
 	if (slot >= ca->slot_count)
 		return -EINVAL;
+	slot = array_index_nospec(slot, ca->slot_count);
 	sl = &ca->slot_info[slot];
 
 	/* check if the slot is actually running */