From: Sage Weil <sage@inktank.com>
Date: Wed, 24 Oct 2012 23:12:58 +0000 (-0700)
Subject: libceph: avoid NULL kref_put when osd reset races with alloc_msg
X-Git-Tag: v3.7-rc4~24^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bd952615a42d7e2ce3fa2c632e808e804637a1a;p=pandora-kernel.git

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>
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