diff -up openssh-7.4p1/servconf.c.memory openssh-7.4p1/servconf.c

--- openssh-7.4p1/servconf.c.memory	2016-12-23 15:37:48.181422360 +0100

+++ openssh-7.4p1/servconf.c	2016-12-23 15:38:30.189429116 +0100

@@ -2006,6 +2006,8 @@ copy_set_server_options(ServerOptions *d

 		dst->n = src->n; \

 } while (0)

+	u_int i;

+

 	M_CP_INTOPT(password_authentication);

 	M_CP_INTOPT(gss_authentication);

 	M_CP_INTOPT(pubkey_authentication);

@@ -2058,8 +2060,10 @@ copy_set_server_options(ServerOptions *d

 } while(0)

 #define M_CP_STRARRAYOPT(n, num_n) do {\

 	if (src->num_n != 0) { \

+		for (i = 0; i < dst->num_n; i++) \

+			free(dst->n[i]); \

 		for (dst->num_n = 0; dst->num_n < src->num_n; dst->num_n++) \

-			dst->n[dst->num_n] = xstrdup(src->n[dst->num_n]); \

+			dst->n[dst->num_n] = src->n[dst->num_n]; \

 	} \

 } while(0)

 #define M_CP_STRARRAYOPT_ALLOC(n, num_n) do { \