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-rw-r--r--drivers/isdn/capi/kcapi.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index cb0afe897162..7313454e403a 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -480,6 +480,11 @@ int detach_capi_ctr(struct capi_ctr *ctr)
ctr_down(ctr, CAPI_CTR_DETACHED);
+ if (ctr->cnr < 1 || ctr->cnr - 1 >= CAPI_MAXCONTR) {
+ err = -EINVAL;
+ goto unlock_out;
+ }
+
if (capi_controller[ctr->cnr - 1] != ctr) {
err = -EINVAL;
goto unlock_out;