| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.16 138/158] libceph: gracefully handle large reply messages from the mon | Date | Mon, 15 Sep 2014 12:26:17 -0700 |
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3.16-stable review patch. If anyone has any objections, please let me know.
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From: Sage Weil <sage@redhat.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@redhat.com> Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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