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Commit 73c3d481 authored by Sage Weil's avatar Sage Weil Committed by Ilya Dryomov
Browse files

libceph: gracefully handle large reply messages from the mon 



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.

CC: stable@vger.kernel.org
Signed-off-by: default avatarSage Weil <sage@redhat.com>
Reviewed-by: default avatarIlya Dryomov <ilya.dryomov@inktank.com>
parent 255939e7

net/ceph/mon_client.c

+8 −0
Original line number Diff line number Diff line
@@ -1181,7 +1181,15 @@ static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con, 
	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;

}