rgw/notifications: free completion pointer using unique_ptr

also fix access to possible dpp dangling pointer

Fixes: https://tracker.ceph.com/issues/67658

Signed-off-by: Yuval Lifshitz <ylifshit@ibm.com>

1 files changed, 15 insertions, 20 deletions

diff --git a/src/rgw/driver/rados/rgw_notify.cc b/src/rgw/driver/rados/rgw_notify.cc
index 6b1dd9651f0..6fdc4b91677 100644
--- a/src/rgw/driver/rados/rgw_notify.cc
+++ b/src/rgw/driver/rados/rgw_notify.cc
@@ -60,22 +60,19 @@ auto make_stack_allocator() {
 const std::string Q_LIST_OBJECT_NAME = "queues_list_object";
 
 struct PublishCommitCompleteArg {
+    PublishCommitCompleteArg(const std::string& _queue_name, CephContext* _cct)
+            : queue_name{_queue_name}, cct{_cct} {}
 
-    PublishCommitCompleteArg(std::string _queue_name, const DoutPrefixProvider *_dpp)
-            : queue_name{std::move(_queue_name)}, dpp{_dpp} {}
-
-    std::string queue_name;
-    const DoutPrefixProvider *dpp;
+    const std::string queue_name;
+    CephContext* const cct;
 };
 
-void publish_commit_completion(rados_completion_t completion, void *arg) {
-    auto *comp_obj = reinterpret_cast<librados::AioCompletionImpl *>(completion);
-    std::unique_ptr<PublishCommitCompleteArg> pcc_arg(reinterpret_cast<PublishCommitCompleteArg *>(arg));
-    if (comp_obj->get_return_value() < 0) {
-        ldpp_dout(pcc_arg->dpp, 1) << "ERROR: failed to commit reservation to queue: "
-                                   << pcc_arg->queue_name << ". error: " << comp_obj->get_return_value()
-                                   << dendl;
-    }
+void publish_commit_completion(rados_completion_t completion, void* arg) {
+  std::unique_ptr<PublishCommitCompleteArg> pcc_args{reinterpret_cast<PublishCommitCompleteArg*>(arg)};
+  if (const auto rc = rados_aio_get_return_value(completion); rc < 0) {
+    ldout(pcc_args->cct, 1) << "ERROR: failed to commit reservation to queue: "
+      << pcc_args->queue_name << ". error: " << rc << dendl;
+  }
 };
 
 class Manager : public DoutPrefixProvider {
@@ -1243,19 +1240,17 @@ int publish_commit(rgw::sal::Object* obj,
       std::vector<buffer::list> bl_data_vec{std::move(bl)};
       librados::ObjectWriteOperation op;
       cls_2pc_queue_commit(op, bl_data_vec, topic.res_id);
-      aio_completion_ptr completion {librados::Rados::aio_create_completion()};
-      auto pcc_arg = make_unique<PublishCommitCompleteArg>(queue_name, dpp);
-      completion->set_complete_callback(pcc_arg.get(), publish_commit_completion);
-      auto &io_ctx = res.store->getRados()->get_notif_pool_ctx();
-      int ret = io_ctx.aio_operate(queue_name, completion.get(), &op);
       topic.res_id = cls_2pc_reservation::NO_ID;
-      if (ret < 0) {
+      auto pcc_arg = make_unique<PublishCommitCompleteArg>(queue_name, dpp->get_cct());
+      aio_completion_ptr completion{librados::Rados::aio_create_completion(pcc_arg.get(), publish_commit_completion)};
+      auto& io_ctx = res.store->getRados()->get_notif_pool_ctx();
+      if (const int ret = io_ctx.aio_operate(queue_name, completion.get(), &op); ret < 0) {
         ldpp_dout(dpp, 1) << "ERROR: failed to commit reservation to queue: "
                           << queue_name << ". error: " << ret << dendl;
         return ret;
       }
+      // args will be released inside the callback
       pcc_arg.release();
-      completion.release();
     } else {
       try {
         // TODO add endpoint LRU cache