cls_rgw: change scoping of suggested changes vars

Fixes: #3127
Bad variable scoping made it so that specific variables
weren't initialized between suggested changes iterations.
This specifically affected a case where in a specific
change we had an updated followed by a remove, and the
remove was on a non-existent key (e.g., was already
removed earlier). We ended up re-substracting the
object stats, as the entry wasn't reset between
the iterations (and we didn't read it because the
key didn't exist).

backport:argonaut
Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/src/cls_rgw.cc b/src/cls_rgw.cc
index c46be4ad8c4..8523317d967 100644
--- a/src/cls_rgw.cc
+++ b/src/cls_rgw.cc
@@ -337,12 +337,11 @@ int rgw_dir_suggest_changes(cls_method_context_t hctx, bufferlist *in, bufferlis
   }
 
   bufferlist::iterator in_iter = in->begin();
-  __u8 op;
-  rgw_bucket_dir_entry cur_change;
-  rgw_bucket_dir_entry cur_disk;
-  bufferlist op_bl;
 
   while (!in_iter.end()) {
+    __u8 op;
+    rgw_bucket_dir_entry cur_change;
+    rgw_bucket_dir_entry cur_disk;
     try {
       ::decode(op, in_iter);
       ::decode(cur_change, in_iter);