autofs-5.1.8 - fix memory leak in update_hosts_mounts()

From: Ian Kent <raven@themaw.net>

Coverity has reported a memory leak in update_hosts_mounts() introduced
by the map reload deadlock fix.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 CHANGELOG              |    1 +
 modules/lookup_hosts.c |   13 +++++++------
 2 files changed, 8 insertions(+), 6 deletions(-)

--- autofs-5.1.7.orig/CHANGELOG
+++ autofs-5.1.7/CHANGELOG
@@ -109,6 +109,7 @@
 - coverity fix for invalid access.
 - fix hosts map deadlock on restart.
 - fix deadlock with hosts map reload.
+- fix memory leak in update_hosts_mounts().
 
 25/01/2021 autofs-5.1.7
 - make bind mounts propagation slave by default.
--- autofs-5.1.7.orig/modules/lookup_hosts.c
+++ autofs-5.1.7/modules/lookup_hosts.c
@@ -307,20 +307,21 @@ next:
 	}
 	pthread_cleanup_pop(1);
 
-	while (head) {
+	entries = head;
+	while (entries) {
 		debug(ap->logopt, MODPREFIX
-		      "attempt to update exports for %s", head->key);
+		      "attempt to update exports for %s", entries->key);
 
 		master_source_current_wait(ap->entry);
 		ap->entry->current = source;
 		ap->flags |= MOUNT_FLAG_REMOUNT;
-		ret = ctxt->parse->parse_mount(ap, head->key, strlen(head->key),
-					       head->entry, ctxt->parse->context);
+		ret = ctxt->parse->parse_mount(ap, entries->key, strlen(entries->key),
+					       entries->entry, ctxt->parse->context);
 		if (ret)
 			warn(ap->logopt, MODPREFIX
-			     "failed to parse mount %s", head->entry);
+			     "failed to parse mount %s", entries->entry);
 		ap->flags &= ~MOUNT_FLAG_REMOUNT;
-		head = head->next;
+		entries = entries->next;
 	}
 	pthread_cleanup_pop(1);
 }