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authorJohn Johansen <john.johansen@canonical.com>2017-01-16 00:42:40 -0800
committerJohn Johansen <john.johansen@canonical.com>2017-01-16 01:18:32 -0800
commit293a4886f93f1d4f01ef2642b81c2509a5376ce5 (patch)
treee09608c8f8de46c9b86937f32b7373a153d14020 /security
parent474d6b75106229025ab6b7bbabf2f9c246e928e1 (diff)
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>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/include/match.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h
index a1c04fe86790..d751c8bf72cd 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)
*