linux-kernel - [PATCH 4.9 34/63] libceph: fix CEPH_FEATURE_CEPHX_V2 check in calc

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Message-Id: <20190111131051.026277590@linuxfoundation.org>
Date:   Fri, 11 Jan 2019 15:14:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Ilya Dryomov <idryomov@...il.com>
Subject: [PATCH 4.9 34/63] libceph: fix CEPH_FEATURE_CEPHX_V2 check in calc_signature()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <idryomov@...il.com>

Upstream commit cc255c76c70f ("libceph: implement CEPHX_V2 calculation
mode") was adjusted incorrectly: CEPH_FEATURE_CEPHX_V2 if condition got
inverted, thus breaking 4.9.144 and later kernels for all setups that
use cephx.

Cc: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
---
 net/ceph/auth_x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ceph/auth_x.c
+++ b/net/ceph/auth_x.c
@@ -804,7 +804,7 @@ static int calc_signature(struct ceph_x_
 	void *enc_buf = au->enc_buf;
 	int ret;
 
-	if (msg->con->peer_features & CEPH_FEATURE_CEPHX_V2) {
+	if (!(msg->con->peer_features & CEPH_FEATURE_CEPHX_V2)) {
 		struct {
 			__le32 len;
 			__le32 header_crc;