autofs-5.1.8 - fix loop under run in cache_get_offset_parent()

From: Frank Sorenson <sorenson@redhat.com>

To avoid reading memory outside of the the string
allocated for parent, tail needs to stop when it
reaches or passes parent, even if it doesn't
actually equal parent.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
---
 CHANGELOG   |    1 +
 lib/cache.c |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

--- autofs-5.1.4.orig/CHANGELOG
+++ autofs-5.1.4/CHANGELOG
@@ -86,6 +86,7 @@
 - fix root offset error handling.
 - fix nonstrict fail handling of last offset mount.
 - dont fail on duplicate offset entry tree add.
+- fix loop under run in cache_get_offset_parent().
 
 xx/xx/2018 autofs-5.1.5
 - fix flag file permission.
--- autofs-5.1.4.orig/lib/cache.c
+++ autofs-5.1.4/lib/cache.c
@@ -680,7 +680,7 @@ struct mapent *cache_get_offset_parent(s
 		*tail = 0;
 
 		tail--;
-		if (tail == parent)
+		if (tail <= parent)
 			break;
 
 		me = cache_lookup_distinct(mc, parent);