linux-kernel - [PATCH 3.16 138/158] libceph: gracefully handle large reply messages from the mon

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Message-Id: <20140915192547.013796985@linuxfoundation.org>
Date:	Mon, 15 Sep 2014 12:26:17 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sage Weil <sage@...hat.com>,
	Ilya Dryomov <ilya.dryomov@...tank.com>
Subject: [PATCH 3.16 138/158] libceph: gracefully handle large reply messages from the mon

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

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

From: Sage Weil <sage@...hat.com>

commit 73c3d4812b4c755efeca0140f606f83772a39ce4 upstream.

We preallocate a few of the message types we get back from the mon.  If we
get a larger message than we are expecting, fall back to trying to allocate
a new one instead of blindly using the one we have.

Signed-off-by: Sage Weil <sage@...hat.com>
Reviewed-by: Ilya Dryomov <ilya.dryomov@...tank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/ceph/mon_client.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -1181,7 +1181,15 @@ static struct ceph_msg *mon_alloc_msg(st
 	if (!m) {
 		pr_info("alloc_msg unknown type %d\n", type);
 		*skip = 1;
+	} else if (front_len > m->front_alloc_len) {
+		pr_warning("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
+			   front_len, m->front_alloc_len,
+			   (unsigned int)con->peer_name.type,
+			   le64_to_cpu(con->peer_name.num));
+		ceph_msg_put(m);
+		m = ceph_msg_new(type, front_len, GFP_NOFS, false);
 	}
+
 	return m;
 }
 


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