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fix non-deterministic behavior

This commit is contained in:
Jan Steemann 2016-04-08 16:42:22 +02:00
parent f2e2dbb435
commit f725b01036
1 changed files with 4 additions and 1 deletions
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5
arangod/V8Server/V8Traverser.cpp
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@ -1039,8 +1039,11 @@ void DepthFirstTraverser::EdgeGetter::nextEdge(
TRI_ASSERT(!_results.empty());
auto opRes = _results.top();
TRI_ASSERT(opRes != nullptr);
// note: we need to check *first* that there is actually something in the buffer
// before we access its internals. otherwise, the buffer contents are uninitialized
// and non-deterministic behavior will be the consequence
VPackSlice edge = opRes->slice();
if (!edge.isArray() || edge.length() <= *last) {
if (opRes->buffer->empty() || !edge.isArray() || edge.length() <= *last) {
if (cursor->hasMore()) {
// Fetch next and try again
cursor->getMore(opRes);