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-rw-r--r--sys/kern/uipc_usrreq.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index e3ebf9b..327026d 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -617,6 +617,9 @@ uipc_ctloutput(struct socket *so, struct sockopt *sopt)
struct xucred xu;
int error, optval;
+ if (sopt->sopt_level != 0)
+ return (EINVAL);
+
UNP_LOCK();
unp = sotounpcb(so);
if (unp == NULL) {
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