autofs-5.1.7 - add length check in umount_subtree_mounts()

From: Ian Kent <raven@themaw.net>

Coverity: fixed_size_dest: You might overrun the 4097-character
	  fixed-size string "key" by copying "me->key" without
	  checking the length.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 CHANGELOG          |    1 +
 daemon/automount.c |    5 +++++
 2 files changed, 6 insertions(+)

--- autofs-5.1.4.orig/CHANGELOG
+++ autofs-5.1.4/CHANGELOG
@@ -55,6 +55,7 @@
 - fix possible memory leak in master_parse().
 - fix possible memory leak in mnts_add_amdmount().
 - fix double unlock in parse_mount().
+- add length check in umount_subtree_mounts().
 
 xx/xx/2018 autofs-5.1.5
 - fix flag file permission.
--- autofs-5.1.4.orig/daemon/automount.c
+++ autofs-5.1.4/daemon/automount.c
@@ -562,6 +562,11 @@ static int umount_subtree_mounts(struct
 			left++;
 		}
 
+		if (me->len > PATH_MAX) {
+			crit(ap->logopt, "me->key too long for buffer");
+			return 1;
+		}
+
 		strcpy(key, me->key);
 
 		cache_unlock(mc);