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net: call cgroup_sk_alloc() earlier in sk_clone_lock()

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If for some reason, the newly allocated child need to be freed,
we will call cgroup_put() (via sk_free_unlock_clone()) while the
corresponding cgroup_get() was not yet done, and we will free memory
too soon.

Fixes: d979a39d72 ("cgroup: duplicate cgroup reference when cloning sockets")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-10-10 19:12:33 -07:00 committed by David S. Miller
parent 75cb070960
commit c0576e3975
1 changed files with 1 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
net/core/sock.c
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@ -1687,6 +1687,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
atomic_set(&newsk->sk_zckey, 0); atomic_set(&newsk->sk_zckey, 0);
sock_reset_flag(newsk, SOCK_DONE); sock_reset_flag(newsk, SOCK_DONE);
cgroup_sk_alloc(&newsk->sk_cgrp_data);
rcu_read_lock(); rcu_read_lock();
filter = rcu_dereference(sk->sk_filter); filter = rcu_dereference(sk->sk_filter);
@ -1718,8 +1719,6 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
newsk->sk_incoming_cpu = raw_smp_processor_id(); newsk->sk_incoming_cpu = raw_smp_processor_id();
atomic64_set(&newsk->sk_cookie, 0); atomic64_set(&newsk->sk_cookie, 0);
cgroup_sk_alloc(&newsk->sk_cgrp_data);
/* /*
* Before updating sk_refcnt, we must commit prior changes to memory * Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.txt for details) * (Documentation/RCU/rculist_nulls.txt for details)