commit 9bd952615a42d7e2ce3fa2c632e808e804637a1a
author Sage Weil <sage@inktank.com> Wed Oct 24 16:12:58 2012 -0700
committer Sage Weil <sage@inktank.com> Wed Oct 24 16:19:19 2012 -0700
tree 7eb86ac8c5f00f160cf5dc23d1a5d89ab951fcd5
parent 588377d6199034c36d335e7df5818b731fea072c

libceph: avoid NULL kref_put when osd reset races with alloc_msg

The ceph_on_in_msg_alloc() method drops con->mutex while it allocates a
message.  If that races with a timeout that resends a zillion messages and
resets the connection, and the ->alloc_msg() method returns a NULL message,
it will call ceph_msg_put(NULL) and BUG.

Fix by only calling put if msg is non-NULL.

Fixes http://tracker.newdream.net/issues/3142

Signed-off-by: Sage Weil <sage@inktank.com>