tree 8da638b921498bba5fca1fc2b4192166f45700ef
parent 0b938a2e2cf0b0a2c8bac9769111545aff0fee97
author John Johansen <john.johansen@canonical.com> 1450318150 -0800
committer John Johansen <john.johansen@canonical.com> 1468338190 -0700

apparmor: fix refcount race when finding a child profile

When finding a child profile via an rcu critical section, the profile
may be put and scheduled for deletion after the child is found but
before its refcount is incremented.

Protect against this by repeating the lookup if the profiles refcount
is 0 and is one its way to deletion.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>