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Index: head/sys/netinet/ip_output.c
===================================================================
--- head/sys/netinet/ip_output.c
+++ head/sys/netinet/ip_output.c
@@ -681,6 +681,13 @@
done:
if (ro == &iproute)
RO_RTFREE(ro);
+ else if (rte == NULL)
+ /*
+ * If the caller supplied a route but somehow the reference
+ * to it has been released need to prevent the caller
+ * calling RTFREE on it again.
+ */
+ ro->ro_rt = NULL;
if (have_ia_ref)
ifa_free(&ia->ia_ifa);
return (error);

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