NetLabel: correct CIPSO tag handling when adding new DOI definitions

The current netlbl_cipsov4_add_common() function has two problems which are
fixed with this patch.  The first is an off-by-one bug where it is possibile to
overflow the doi_def->tags[] array.  The second is a bug where the same
doi_def->tags[] array was not always fully initialized, which caused sporadic
failures.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 4afc75f9e37..73e0ff469bf 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -130,12 +130,12 @@ static int netlbl_cipsov4_add_common(struct genl_info *info,
 
         nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
                 if (nla->nla_type == NLBL_CIPSOV4_A_TAG) {
-                        if (iter > CIPSO_V4_TAG_MAXCNT)
+                        if (iter >= CIPSO_V4_TAG_MAXCNT)
                                 return -EINVAL;
                         doi_def->tags[iter++] = nla_get_u8(nla);
                 }
-        if (iter < CIPSO_V4_TAG_MAXCNT)
-                doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
+        while (iter < CIPSO_V4_TAG_MAXCNT)
+                doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
 
         return 0;
 }