SELinux: skip file_name_trans_write() when policy downgraded.

When policy version is less than POLICYDB_VERSION_FILENAME_TRANS,
skip file_name_trans_write().

Signed-off-by: Roy.Li <rongqing.li@windriver.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 102e9ec1b77a..d246aca3f4fb 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -3222,6 +3222,9 @@ static int filename_trans_write(struct policydb *p, void *fp)
         __le32 buf[1];
         int rc;
 
+        if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
+                return 0;
+
         nel = 0;
         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
         if (rc)