[PATCH 5.6 086/118] ceph: fix endianness bug when handling MDS session feature bits

[Greg Kroah-Hartman]

From: Jeff Layton <jlay...@kernel.org>

commit 0fa8263367db9287aa0632f96c1a5f93cc478150 upstream.

Eduard reported a problem mounting cephfs on s390 arch. The feature
mask sent by the MDS is little-endian, so we need to convert it
before storing and testing against it.

Cc: sta...@vger.kernel.org
Reported-and-Tested-by: Eduard Shishkin <edwa...@linux.ibm.com>
Signed-off-by: Jeff Layton <jlay...@kernel.org>
Reviewed-by: "Yan, Zheng" <z...@redhat.com>
Signed-off-by: Ilya Dryomov <idryo...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/ceph/mds_client.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -3116,8 +3116,7 @@ static void handle_session(struct ceph_m
        void *end = p + msg->front.iov_len;
        struct ceph_mds_session_head *h;
        u32 op;
-       u64 seq;
-       unsigned long features = 0;
+       u64 seq, features = 0;
        int wake = 0;
        bool blacklisted = false;
 
@@ -3136,9 +3135,8 @@ static void handle_session(struct ceph_m
                        goto bad;
                /* version >= 3, feature bits */
                ceph_decode_32_safe(&p, end, len, bad);
-               ceph_decode_need(&p, end, len, bad);
-               memcpy(&features, p, min_t(size_t, len, sizeof(features)));
-               p += len;
+               ceph_decode_64_safe(&p, end, features, bad);
+               p += len - sizeof(features);
        }
 
        mutex_lock(&mdsc->mutex);