From: xie xingguo <xie.xingguo@zte.com.cn>
Date: Sat, 24 Dec 2016 08:48:24 +0000 (+0800)
Subject: os/bluestore/BitAllocator: fix potential null pointer access
X-Git-Tag: v12.0.0~182^2~3
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=267eb9576fc39e0d20d7491b5a2c55be9c7f7722;p=ceph.git

os/bluestore/BitAllocator: fix potential null pointer access

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

diff --git a/src/os/bluestore/BitAllocator.cc b/src/os/bluestore/BitAllocator.cc
index 1b48fa0abf0..105e622c6d1 100644
--- a/src/os/bluestore/BitAllocator.cc
+++ b/src/os/bluestore/BitAllocator.cc
@@ -581,6 +581,9 @@ int64_t BitMapZone::alloc_blocks_dis(int64_t num_blocks,
   BitMapEntityIter <BmapEntry> iter = BitMapEntityIter<BmapEntry>(
           m_bmap_list, bmap_idx);
   bmap = iter.next();
+  if (!bmap) {
+    return 0;
+  }
 
   while (allocated < num_blocks) {
     blk_off = zone_blk_off + bmap_idx * bmap->size();