From: Sage Weil <sage@redhat.com>
Date: Tue, 17 Apr 2018 11:44:56 +0000 (-0500)
Subject: mon/LogMonitor: do not crash on log sub w/ no messages
X-Git-Tag: v13.1.0~193^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=9cc7e451c5cbc6961cf5a12e8d7fc335ae130b71;p=ceph.git

mon/LogMonitor: do not crash on log sub w/ no messages

If sv == 0, we will fail to fetch a value and assert out.  Skip the loop
in that case.

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

diff --git a/src/mon/LogMonitor.cc b/src/mon/LogMonitor.cc
index b460c521223c..473b53226626 100644
--- a/src/mon/LogMonitor.cc
+++ b/src/mon/LogMonitor.cc
@@ -639,7 +639,7 @@ void LogMonitor::_create_sub_incremental(MLog *mlog, int level, version_t sv)
   }
 
   version_t summary_ver = summary.version;
-  while (sv <= summary_ver) {
+  while (sv && sv <= summary_ver) {
     bufferlist bl;
     int err = get_version(sv, bl);
     assert(err == 0);