selinux: Augment BUG_ON assertion for secclass_map.

Ensure that we catch any cases where tclass == 0.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 2d5e1b0..324acc6 100644 (file)
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -116,6 +116,7 @@ static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
                return;
        }
 
+       BUG_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map));
        perms = secclass_map[tclass-1].perms;
 
        audit_log_format(ab, " {");
@@ -164,7 +165,7 @@ static void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tcla
                kfree(scontext);
        }
 
-       BUG_ON(tclass >= ARRAY_SIZE(secclass_map));
+       BUG_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map));
        audit_log_format(ab, " tclass=%s", secclass_map[tclass-1].name);
 }