luminous: rgw: RGWCoroutine::call(nullptr) sets retcode=0 #30329
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callers generally expect 'yield call(...);' to set retcode with the
result of the given coroutine. it's valid to call() a nullptr, but
that's not always clear at the call site - for example, this critical
piece of code in RGWBucketSyncSingleEntryCR::operate():
if (sync_status == 0) {
/* update marker */
set_status() << "calling marker_tracker->finish(" << entry_marker << ")";
yield call(marker_tracker->finish(entry_marker));
sync_status = retcode;
}
marker_tracker->finish() only returns a coroutine when it needs to flush
the marker; otherwise it returns a nullptr. as a result, 'retcode' may
not be assigned as expected by the call(), and a previous value is
mistakenly returned up the stack
Fixes: https://tracker.ceph.com/issues/41412
Signed-off-by: Casey Bodley <cbodley@redhat.com>
(cherry picked from commit 7d12a11)
This was referenced Sep 11, 2019
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jenkins test signed |
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jenkins test submodules |
cbodley
approved these changes
Nov 5, 2019
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backport tracker: https://tracker.ceph.com/issues/41626
backport of #29856
parent tracker: https://tracker.ceph.com/issues/41412
this backport was staged using https://github.com/ceph/ceph/blob/master/src/script/ceph-backport.sh