libceph: weaken sizeof check in ceph_x_verify_authorizer_reply()

Allow for extending ceph_x_authorize_reply in the future.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c
index 462786f571e7..b52732337ca6 100644
--- a/net/ceph/auth_x.c
+++ b/net/ceph/auth_x.c
@@ -737,8 +737,10 @@ static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
         ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
         if (ret < 0)
                 return ret;
-        if (ret != sizeof(*reply))
-                return -EPERM;
+        if (ret < sizeof(*reply)) {
+                pr_err("bad size %d for ceph_x_authorize_reply\n", ret);
+                return -EINVAL;
+        }
 
         if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
                 ret = -EPERM;