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Message-Id: <20220607165011.012168594@linuxfoundation.org>
Date: Tue, 7 Jun 2022 19:05:38 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Luís Henriques <lhenriques@...e.de>,
Jeff Layton <jlayton@...nel.org>,
Ilya Dryomov <idryomov@...il.com>
Subject: [PATCH 5.17 746/772] ceph: fix decoding of client session messages flags
From: Luís Henriques <lhenriques@...e.de>
commit ea16567f11018e2f58e72b667b0c803ff92b8153 upstream.
The cephfs kernel client started to show the message:
ceph: mds0 session blocklisted
when mounting a filesystem. This is due to the fact that the session
messages are being incorrectly decoded: the skip needs to take into
account the 'len'.
While there, fixed some whitespaces too.
Cc: stable@...r.kernel.org
Fixes: e1c9788cb397 ("ceph: don't rely on error_string to validate blocklisted session.")
Signed-off-by: Luís Henriques <lhenriques@...e.de>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/ceph/mds_client.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -3378,13 +3378,17 @@ static void handle_session(struct ceph_m
}
if (msg_version >= 5) {
- u32 flags;
- /* version >= 4, struct_v, struct_cv, len, metric_spec */
- ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 2, bad);
+ u32 flags, len;
+
+ /* version >= 4 */
+ ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
+ ceph_decode_32_safe(&p, end, len, bad); /* len */
+ ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
+
/* version >= 5, flags */
- ceph_decode_32_safe(&p, end, flags, bad);
+ ceph_decode_32_safe(&p, end, flags, bad);
if (flags & CEPH_SESSION_BLOCKLISTED) {
- pr_warn("mds%d session blocklisted\n", session->s_mds);
+ pr_warn("mds%d session blocklisted\n", session->s_mds);
blocklisted = true;
}
}
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