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apparmor: add get_dfa() fn

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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>
This commit is contained in:
John Johansen 2017-01-16 00:42:40 -08:00
parent 474d6b7510
commit 293a4886f9
1 changed files with 15 additions and 0 deletions
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15
security/apparmor/include/match.h
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@ -127,6 +127,21 @@ 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)