From ed6ad7d359cf933869a28fecd9ce3b811932cbd6 Mon Sep 17 00:00:00 2001
From: "kroki@mysql.com" <>
Date: Mon, 15 May 2006 11:56:02 +0400
Subject: [PATCH] Fix possible race.  Use LOCK_grant on access to
 grant_version.

---
 sql/sql_acl.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sql/sql_acl.cc b/sql/sql_acl.cc
index d66a631dbcc..a4d46244ad4 100644
--- a/sql/sql_acl.cc
+++ b/sql/sql_acl.cc
@@ -6009,20 +6009,21 @@ void fill_effective_table_privileges(THD *thd, GRANT_INFO *grant,
   }
 
   /* table privileges */
+  rw_rdlock(&LOCK_grant);
   if (grant->version != grant_version)
   {
-    rw_rdlock(&LOCK_grant);
     grant->grant_table=
       table_hash_search(sctx->host, sctx->ip, db,
 			sctx->priv_user,
 			table, 0);              /* purecov: inspected */
     grant->version= grant_version;              /* purecov: inspected */
-    rw_unlock(&LOCK_grant);
   }
   if (grant->grant_table != 0)
   {
     grant->privilege|= grant->grant_table->privs;
   }
+  rw_unlock(&LOCK_grant);
+
   DBUG_PRINT("info", ("privilege 0x%lx", grant->privilege));
   DBUG_VOID_RETURN;
 }