1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 4033cf96c7d7..a850f8d7d4b5 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2804,8 +2804,15 @@ static int dw_mci_init_slot_caps(struct dw_mci_slot *slot)
         } else {
                 ctrl_id = to_platform_device(host->dev)->id;
         }
-        if (drv_data && drv_data->caps)
+
+        if (drv_data && drv_data->caps) {
+                if (ctrl_id >= drv_data->num_caps) {
+                        dev_err(host->dev, "invalid controller id %d\n",
+                                ctrl_id);
+                        return -EINVAL;
+                }
                 mmc->caps |= drv_data->caps[ctrl_id];
+        }
 
         if (host->pdata->caps2)
                 mmc->caps2 = host->pdata->caps2;