1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index 9f73bc2727c2..f55531869313 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -821,6 +821,8 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data)
                                 return -EFAULT;
                 }
                 card = get_capi_ctr_by_nr(ldef.contr);
+                if (!card)
+                        return -EINVAL;
                 card = capi_ctr_get(card);
                 if (!card)
                         return -ESRCH;