D58840.1793863596.diff
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	diff --git a/sys/net/if.c b/sys/net/if.c
	--- a/sys/net/if.c
	+++ b/sys/net/if.c
	@@ -1123,7 +1123,7 @@
	struct ifaddr *ifa;
	int i;
	struct domain *dp;
	- void *if_afdata[AF_MAX];
	+ void *if_afdata[nitems(ifp->if_afdata)];
	#ifdef VIMAGE
	bool shutdown;

	diff --git a/sys/net/if_private.h b/sys/net/if_private.h
	--- a/sys/net/if_private.h
	+++ b/sys/net/if_private.h
	@@ -103,7 +103,7 @@
	void if_hw_addr; / hardware link-level address */
	const u_int8_t if_broadcastaddr; / linklevel broadcast bytestring */
	struct mtx if_afdata_lock;
	- void *if_afdata[AF_MAX];
	+ void if_afdata[AF_MAX - 1]; / off by one for historical reasons */
	int if_afdata_initialized;

	/* Additional features hung off the interface. */