From f8d4a51b02abd2f7bb4c5a874d8d83f4dedc7a6a Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@samba.org>
Date: Wed, 29 Jun 2016 13:38:19 +0200
Subject: [PATCH] s3-winbind: Fix memory leak with each cached credential login

When we allow offline logon and have a lot of logins, windbind will leak
4k of memory which each log in. On systems with heavy load this can grow
quickly and the OOM killer will kill Winbind.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11999

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Wed Jun 29 19:03:53 CEST 2016 on sn-devel-144

(cherry picked from commit 826f61960ec74deedc9d556a3b8fe04d9178dcd8)
---
 source3/winbindd/winbindd_cache.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/source3/winbindd/winbindd_cache.c b/source3/winbindd/winbindd_cache.c
index cf3ed71..5dd9f4f 100644
--- a/source3/winbindd/winbindd_cache.c
+++ b/source3/winbindd/winbindd_cache.c
@@ -3471,7 +3471,7 @@ NTSTATUS wcache_remove_oldest_cached_creds(struct winbindd_domain *domain, const
 	struct winbind_cache *cache = get_cache(domain);
 	NTSTATUS status;
 	int ret;
-	struct cred_list *cred, *oldest = NULL;
+	struct cred_list *cred, *next, *oldest = NULL;
 
 	if (!cache->tdb) {
 		return NT_STATUS_INTERNAL_DB_ERROR;
@@ -3540,7 +3540,11 @@ NTSTATUS wcache_remove_oldest_cached_creds(struct winbindd_domain *domain, const
 		status = NT_STATUS_UNSUCCESSFUL;
 	}
 done:
-	SAFE_FREE(wcache_cred_list);
+	for (cred = wcache_cred_list; cred; cred = next) {
+		next = cred->next;
+		DLIST_REMOVE(wcache_cred_list, cred);
+		SAFE_FREE(cred);
+	}
 	SAFE_FREE(oldest);
 
 	return status;
-- 
2.9.0