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libceph: ceph_build_auth() doesn't need ceph_auth_build_hello()

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A static bug finder (EBA) on Linux 4.7:

    Double lock in net/ceph/auth.c
    second lock at 108: mutex_lock(& ac->mutex); [ceph_auth_build_hello]
    after calling from 263: ret = ceph_auth_build_hello(ac, msg_buf, msg_len);
    if ! ac->protocol -> true at 262
    first lock at 261: mutex_lock(& ac->mutex); [ceph_build_auth]

ceph_auth_build_hello() is never called, because the protocol is always
initialized, whether we are checking existing tickets (in delayed_work())
or getting new ones after invalidation (in invalidate_authorizer()).

Reported-by: Iago Abal <iari@itu.dk>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2016-09-23 09:57:57 +02:00
parent fdc723e77b
commit 464691bd52
1 changed files with 1 additions and 3 deletions
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4
net/ceph/auth.c
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@ -262,9 +262,7 @@ int ceph_build_auth(struct ceph_auth_client *ac,
int ret = 0;
mutex_lock(&ac->mutex);
if (!ac->protocol)
ret = ceph_auth_build_hello(ac, msg_buf, msg_len);
else if (ac->ops->should_authenticate(ac))
if (ac->ops->should_authenticate(ac))
ret = ceph_build_auth_request(ac, msg_buf, msg_len);
mutex_unlock(&ac->mutex);
return ret;