crypto: algif_hash - Fix race condition in hash_check_key
commit ad46d7e33219218605ea619e32553daf4f346b9f upstream. We need to lock the child socket in hash_check_key as otherwise two simultaneous calls can cause the parent socket to be freed. Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Willy Tarreau <w@1wt.eu>
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@ -255,22 +255,23 @@ static struct proto_ops algif_hash_ops = {
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static int hash_check_key(struct socket *sock)
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static int hash_check_key(struct socket *sock)
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{
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{
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int err;
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int err = 0;
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struct sock *psk;
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struct sock *psk;
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struct alg_sock *pask;
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struct alg_sock *pask;
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struct algif_hash_tfm *tfm;
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struct algif_hash_tfm *tfm;
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struct sock *sk = sock->sk;
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct alg_sock *ask = alg_sk(sk);
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lock_sock(sk);
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if (ask->refcnt)
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if (ask->refcnt)
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return 0;
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goto unlock_child;
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psk = ask->parent;
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psk = ask->parent;
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pask = alg_sk(ask->parent);
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pask = alg_sk(ask->parent);
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tfm = pask->private;
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tfm = pask->private;
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err = -ENOKEY;
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err = -ENOKEY;
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lock_sock(psk);
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lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
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if (!tfm->has_key)
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if (!tfm->has_key)
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goto unlock;
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goto unlock;
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@ -284,6 +285,8 @@ static int hash_check_key(struct socket *sock)
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unlock:
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unlock:
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release_sock(psk);
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release_sock(psk);
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unlock_child:
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release_sock(sk);
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return err;
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return err;
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}
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}
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