rgw: fetch_remote_obj() compares expected object size

if the size of object data received doesn't match the value returned in
the Rgwx-Object-Size header, fail with -EIO

Fixes: https://tracker.ceph.com/issues/39992
Signed-off-by: Xiaoxi CHEN <xiaoxchen@ebay.com>
Signed-off-by: Casey Bodley <cbodley@redhat.com>
(cherry picked from commit c6c4c5639ea34c49329719c2725886e740acd0b3)

diff --git a/src/rgw/rgw_rados.cc b/src/rgw/rgw_rados.cc
index ac89fc1c3e7dfb3a0adcd3b8f57c4cce8cf5d2c1..4441ff0f577f09fc7b1495b8adda4807240cb19e 100644 (file)
--- a/src/rgw/rgw_rados.cc
+++ b/src/rgw/rgw_rados.cc
@@ -4379,6 +4379,7 @@ int RGWRados::fetch_remote_obj(RGWObjectCtx& obj_ctx,
 
   string etag;
   real_time set_mtime;
+  uint64_t expected_size = 0;
 
   RGWObjState *dest_state = NULL;
 
@@ -4413,7 +4414,8 @@ int RGWRados::fetch_remote_obj(RGWObjectCtx& obj_ctx,
     goto set_err_state;
   }
 
-  ret = conn->complete_request(in_stream_req, &etag, &set_mtime, nullptr, nullptr, nullptr);
+  ret = conn->complete_request(in_stream_req, &etag, &set_mtime,
+                               &expected_size, nullptr, nullptr);
   if (ret < 0) {
     goto set_err_state;
   }
@@ -4421,6 +4423,12 @@ int RGWRados::fetch_remote_obj(RGWObjectCtx& obj_ctx,
   if (ret < 0) {
     goto set_err_state;
   }
+  if (cb.get_data_len() != expected_size) {
+    ret = -EIO;
+    ldout(cct, 0) << "ERROR: object truncated during fetching, expected "
+        << expected_size << " bytes but received " << cb.get_data_len() << dendl;
+    goto set_err_state;
+  }
   if (compressor && compressor->is_compressed()) {
     bufferlist tmp;
     RGWCompressionInfo cs_info;