NetLabel: the CIPSOv4 passthrough mapping does not pass categories correctly

The CIPSO passthrough mapping had a problem when sending categories which
would cause no or incorrect categories to be sent on the wire with a packet.
This patch fixes the problem which was a simple off-by-one bug.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index d19c9ac7727e..e2077a3aa8c0 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -832,8 +832,8 @@ static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
 
         switch (doi_def->type) {
         case CIPSO_V4_MAP_PASS:
-                net_spot_max = host_cat_len - 1;
-                while (net_spot_max > 0 && host_cat[net_spot_max] == 0)
+                net_spot_max = host_cat_len;
+                while (net_spot_max > 0 && host_cat[net_spot_max - 1] == 0)
                         net_spot_max--;
                 if (net_spot_max > net_cat_len)
                         return -EINVAL;