smack: call WARN_ONCE() instead of calling audit_log_start()

Remove the call to audit_log() (which call audit_log_start()) and deal with
the errors in the caller, logging only once if the condition is met.  Calling
audit_log_start() in this location makes buffer allocation and locking more
complicated in the calling tree (audit_filter_user()).

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 8825375cc031..185e2e73cd33 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3615,9 +3615,8 @@ static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
         struct smack_known *skp;
         char *rule = vrule;
 
-        if (!rule) {
-                audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
-                          "Smack: missing rule\n");
+        if (unlikely(!rule)) {
+                WARN_ONCE(1, "Smack: missing rule\n");
                 return -ENOENT;
         }