linux-kernel - [PATCH 3.16.y-ckt 110/126] ceph: fix message length computation

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Message-Id: <1449653896-5236-111-git-send-email-luis.henriques@canonical.com>
Date:	Wed,  9 Dec 2015 09:38:00 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Arnd Bergmann <arnd@...db.de>, "Yan, Zheng" <zyan@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 110/126] ceph: fix message length computation

3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

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

From: Arnd Bergmann <arnd@...db.de>

commit 777d738a5e58ba3b6f3932ab1543ce93703f4873 upstream.

create_request_message() computes the maximum length of a message,
but uses the wrong type for the time stamp: sizeof(struct timespec)
may be 8 or 16 depending on the architecture, while sizeof(struct
ceph_timespec) is always 8, and that is what gets put into the
message.

Found while auditing the uses of timespec for y2038 problems.

Fixes: b8e69066d8af ("ceph: include time stamp in every MDS request")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Yan, Zheng <zyan@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/ceph/mds_client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 92a2548278fc..63f2bc82f4af 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1786,7 +1786,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
 
 	len = sizeof(*head) +
 		pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
-		sizeof(struct timespec);
+		sizeof(struct ceph_timespec);
 
 	/* calculate (max) length for cap releases */
 	len += sizeof(struct ceph_mds_request_release) *
--
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