linux-kernel - [PATCH 3.2 036/102] libceph: gracefully handle large reply messages from the mon

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Message-ID: <lsq.1414880883.669723771@decadent.org.uk>
Date:	Sat, 01 Nov 2014 22:28:03 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Ilya Dryomov" <ilya.dryomov@...tank.com>,
	"Sage Weil" <sage@...hat.com>
Subject: [PATCH 3.2 036/102] libceph: gracefully handle large reply
 messages from the mon

3.2.64-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 net/ceph/mon_client.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -987,7 +987,15 @@ 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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