autofs-5.0.7 - add mapent null check in lookup_nisplus.c:lookup_mount()

From: Ian Kent <raven@themaw.net>

malloc(3) could return null under low memory conditions, add a null check
for this case.
---
 modules/lookup_nisplus.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/lookup_nisplus.c b/modules/lookup_nisplus.c
index 8237a1e..ef942a7 100644
--- a/modules/lookup_nisplus.c
+++ b/modules/lookup_nisplus.c
@@ -584,7 +584,8 @@ int lookup_mount(struct autofs_point *ap, const char *name, int name_len, void *
 		if (me && (me->source == source || *me->key == '/')) {
 			mapent_len = strlen(me->mapent);
 			mapent = malloc(mapent_len + 1);
-			strcpy(mapent, me->mapent);
+			if (mapent)
+				strcpy(mapent, me->mapent);
 		}
 	}
 	cache_unlock(mc);