D16527.diff
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	Index: head/sys/security/mac/mac_framework.c
	===================================================================
	--- head/sys/security/mac/mac_framework.c
	+++ head/sys/security/mac/mac_framework.c
	@@ -586,7 +586,9 @@
	mac_check_structmac_consistent(struct mac *mac)
	{

	- if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN)
	+ /* Require that labels have a non-zero length. */
	+ if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN \|\|
	+ mac->m_buflen <= sizeof(""))
	return (EINVAL);

	return (0);