NetLabel: return the correct error for translated CIPSOv4 tags

The CIPSOv4 translated tag #1 mapping does not always return the correct error
code if the desired mapping does not exist; instead of returning -EPERM it
returns -ENOSPC indicating that the buffer is not large enough to hold the
translated value.  This was caused by failing to check a specific error
condition.  This patch fixes this so that unknown mappings return
-EPERM which is consistent with the rest of the related CIPSOv4 code.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index a056278ad62..c305de6fa20 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -867,6 +867,8 @@ static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def,
                                 return -EPERM;
 
                         net_spot = host_cat_array[host_spot];
+                        if (net_spot >= CIPSO_V4_INV_CAT)
+                                return -EPERM;
                         if (net_spot >= net_clen_bits)
                                 return -ENOSPC;
                         cipso_v4_bitmap_setbit(net_cat, net_spot, 1);
@@ -935,6 +937,8 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
                                 return -EPERM;
 
                         host_spot = net_cat_array[net_spot];
+                        if (host_spot >= CIPSO_V4_INV_CAT)
+                                return -EPERM;
                         if (host_spot >= host_clen_bits)
                                 return -ENOSPC;
                         cipso_v4_bitmap_setbit(host_cat, host_spot, 1);