From: xie xingguo <xie.xingguo@zte.com.cn>
Date: Tue, 5 Jan 2016 08:10:07 +0000 (+0800)
Subject: os: put a guard when read the entire object
X-Git-Tag: v10.0.3~86^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=c07dcd53dc3fde2322e60148c97a5338008756ea;p=ceph.git

os: put a guard when read the entire object

Otherwise the read operation may overflow.

Fixes: #14229
Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
---

diff --git a/src/os/memstore/MemStore.cc b/src/os/memstore/MemStore.cc
index 0733dcc987b6..de00e63ae827 100644
--- a/src/os/memstore/MemStore.cc
+++ b/src/os/memstore/MemStore.cc
@@ -307,7 +307,7 @@ int MemStore::read(
   if (offset >= o->get_size())
     return 0;
   size_t l = len;
-  if (l == 0)  // note: len == 0 means read the entire object
+  if (l == 0 && offset == 0)  // note: len == 0 means read the entire object
     l = o->get_size();
   else if (offset + l > o->get_size())
     l = o->get_size() - offset;