rgw: Prevent overflow of stats cached values

Fixes: http://tracker.ceph.com/issues/20934
Signed-off-by: Aleksei Gutikov <aleksey.gutikov@synesis.ru>

diff --git a/src/rgw/rgw_quota.cc b/src/rgw/rgw_quota.cc
index 8e050a0592d68182f6a737d7be76c11b97c1154d..d94dc0ca4cf74798d0f5b1317eaa601b8d5df434 100644 (file)
--- a/src/rgw/rgw_quota.cc
+++ b/src/rgw/rgw_quota.cc
@@ -241,19 +241,19 @@ public:
     const uint64_t rounded_added = rgw_rounded_objsize(added_bytes);
     const uint64_t rounded_removed = rgw_rounded_objsize(removed_bytes);
 
-    if ((entry->stats.size + added_bytes - removed_bytes) >= 0) {
+    if (((int64_t)(entry->stats.size + added_bytes - removed_bytes)) >= 0) {
       entry->stats.size += added_bytes - removed_bytes;
     } else {
       entry->stats.size = 0;
     }
 
-    if ((entry->stats.size_rounded + rounded_added - rounded_removed) >= 0) {
+    if (((int64_t)(entry->stats.size_rounded + rounded_added - rounded_removed)) >= 0) {
       entry->stats.size_rounded += rounded_added - rounded_removed;
     } else {
       entry->stats.size_rounded = 0;
     }
 
-    if ((entry->stats.num_objects + objs_delta) >= 0) {
+    if (((int64_t)(entry->stats.num_objects + objs_delta)) >= 0) {
       entry->stats.num_objects += objs_delta;
     } else {
       entry->stats.num_objects = 0;