1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index bd00dceacaf0..bde3c88b8b27 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -1147,6 +1147,12 @@ load_unlock_out:
                 if (ctr->state == CAPI_CTR_DETECTED)
                         goto reset_unlock_out;
 
+                if (ctr->reset_ctr == NULL) {
+                        printk(KERN_DEBUG "kcapi: reset: no reset function\n");
+                        retval = -ESRCH;
+                        goto reset_unlock_out;
+                }
+
                 ctr->reset_ctr(ctr);
 
                 retval = wait_on_ctr_state(ctr, CAPI_CTR_DETECTED);