From: John Johansen <john.johansen@canonical.com>
Date: Mon, 16 Jan 2017 08:42:40 +0000 (-0800)
Subject: apparmor: add get_dfa() fn
X-Git-Tag: v4.14-rc1~1477^2~68
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=293a4886f93f1d4f01ef2642b81c2509a5376ce5;p=platform%2Fkernel%2Flinux-rpi.git

apparmor: add get_dfa() fn

The dfa is currently setup to be shared (has the basis of refcounting)
but currently can't be because the count can't be increased.

Signed-off-by: John Johansen <john.johansen@canonical.com>
---

diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h
index a1c04fe..d751c8b 100644
--- a/security/apparmor/include/match.h
+++ b/security/apparmor/include/match.h
@@ -128,6 +128,21 @@ unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state,
 void aa_dfa_free_kref(struct kref *kref);
 
 /**
+ * aa_get_dfa - increment refcount on dfa @p
+ * @dfa: dfa  (MAYBE NULL)
+ *
+ * Returns: pointer to @dfa if @dfa is NULL will return NULL
+ * Requires: @dfa must be held with valid refcount when called
+ */
+static inline struct aa_dfa *aa_get_dfa(struct aa_dfa *dfa)
+{
+	if (dfa)
+		kref_get(&(dfa->count));
+
+	return dfa;
+}
+
+/**
  * aa_put_dfa - put a dfa refcount
  * @dfa: dfa to put refcount   (MAYBE NULL)
  *