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Fix a bug in move construction when move source is empty

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Previously when copying the allocator state we would copy an incorrect
root pointer into the document's current state; while this had a minimal
impact on the allocation state due to the fact that any new allocation
would need to create a new page, this used a potentially stale field of
the moved document when setting up new pages, which could create issues
in future uses of the pages.

This change fixes the core problem and also removes the use of the
_root->allocator from allocate_page since it's not clear why we need it
there in the first place.
This commit is contained in:
Arseny Kapoulkine 2021-05-11 22:45:30 -07:00
parent 56c9afa7c8
commit 8cece4b9fe
2 changed files with 19 additions and 3 deletions
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11
src/pugixml.cpp
View File

@ -526,7 +526,8 @@ PUGI__NS_BEGIN
xml_memory_page* page = xml_memory_page::construct(memory);
assert(page);
page->allocator = _root->allocator;
assert(this == _root->allocator);
page->allocator = this;
return page;
}
@ -7091,8 +7092,12 @@ namespace pugi
#endif
// move allocation state
doc->_root = other->_root;
doc->_busy_size = other->_busy_size;
// note that other->_root may point to the embedded document page, in which case we should keep original (empty) state
if (other->_root != PUGI__GETPAGE(other))
{
doc->_root = other->_root;
doc->_busy_size = other->_busy_size;
}
// move buffer state
doc->buffer = other->buffer;

11
tests/test_document.cpp
View File

@ -1806,4 +1806,15 @@ TEST(document_move_compact_fail)
CHECK(!docs[safe_count+1].first_child());
}
#endif
TEST(document_move_assign_empty)
{
xml_document doc;
doc.append_child(STR("node"));
doc = xml_document();
doc.append_child(STR("node2"));
CHECK_NODE(doc, "<node2/>");
}
#endif