D54162.id.diff
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	diff --git a/sys/netlink/netlink_snl.h b/sys/netlink/netlink_snl.h
	--- a/sys/netlink/netlink_snl.h
	+++ b/sys/netlink/netlink_snl.h
	@@ -106,6 +106,26 @@
	return (data);
	}

	+static inline bool
	+lb_extendz(struct linear_buffer lb, void old, u_int old_len, u_int new_len)
	+{
	+ u_int delta;
	+
	+ /* Is the old buffer the last allocated region in the lb? */
	+ old_len = roundup2(old_len, alignof(__max_align_t));
	+ if ((char *)old + old_len != lb->base + lb->offset)
	+ return (false);
	+
	+ /* Is there room to grow the end of the lb? */
	+ new_len = roundup2(new_len, alignof(__max_align_t));
	+ delta = new_len - old_len;
	+ if (delta > lb->size - lb->offset)
	+ return (false);
	+
	+ lb->offset += delta;
	+ return (true);
	+}
	+
	static inline void
	lb_clear(struct linear_buffer *lb)
	{
	@@ -221,6 +241,12 @@
	return (data);
	}

	+static inline bool
	+snl_extendz(struct snl_state ss, void old, u_int old_len, u_int new_len)
	+{
	+ return (lb_extendz(ss->lb, old, old_len, new_len));
	+}
	+
	static inline void
	snl_clear_lb(struct snl_state *ss)
	{
	@@ -1093,6 +1119,11 @@
	if (nw->error)
	return (false);

	+ if (snl_extendz(nw->ss, nw->base, nw->size, new_size)) {
	+ nw->size = new_size;
	+ return (true);
	+ }
	+
	new_base = snl_allocz(nw->ss, new_size);
	if (new_base == NULL) {
	nw->error = true;