D34627.1784685363.diff
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	diff --git a/sys/netinet/ip_mroute.h b/sys/netinet/ip_mroute.h
	--- a/sys/netinet/ip_mroute.h
	+++ b/sys/netinet/ip_mroute.h
	@@ -265,6 +265,7 @@
	u_long v_bytes_in; /* # bytes in on interface */
	u_long v_bytes_out; /* # bytes out on interface */
	#ifdef _KERNEL
	+#define MROUTE_VIF_SYSCTL_LEN __offsetof(struct vif, v_spin)
	struct mtx v_spin; /* Spin mutex for pkt stats */
	char v_spin_name[32];
	#endif
	diff --git a/sys/netinet/ip_mroute.c b/sys/netinet/ip_mroute.c
	--- a/sys/netinet/ip_mroute.c
	+++ b/sys/netinet/ip_mroute.c
	@@ -2727,18 +2727,23 @@
	static int
	sysctl_viflist(SYSCTL_HANDLER_ARGS)
	{
	- int error;
	+ int error, i;

	if (req->newptr)
	return (EPERM);
	if (V_viftable == NULL) /* XXX unlocked */
	return (0);
	- error = sysctl_wire_old_buffer(req, sizeof(V_viftable) MAXVIFS);
	+ error = sysctl_wire_old_buffer(req, MROUTE_VIF_SYSCTL_LEN * MAXVIFS);
	if (error)
	return (error);

	MRW_RLOCK();
	- error = SYSCTL_OUT(req, V_viftable, sizeof(V_viftable) MAXVIFS);
	+ /* Copy out user-visible portion of vif entry. */
	+ for (i = 0; i < MAXVIFS; i++) {
	+ error = SYSCTL_OUT(req, &V_viftable[i], MROUTE_VIF_SYSCTL_LEN);
	+ if (error)
	+ break;
	+ }
	MRW_RUNLOCK();
	return (error);
	}