Anomie has uploaded a new change for review.
https://gerrit.wikimedia.org/r/161994
Change subject: Break accidental references in Parser::__clone
......................................................................
Break accidental references in Parser::__clone
If you have a reference *to* an object field (anywhere in the call
stack) when you clone the object, the field will be cloned as a
reference rather than as a value.
So we have to break those unexpected references in the cloned object
manually, which is easy enough by making a non-reference copy and then
rebinding the cloned object's reference to this copy.
Bug: 56226
Change-Id: I9c600e9c0845b4fde0366126ce3809d74e2240b4
---
M includes/parser/Parser.php
1 file changed, 15 insertions(+), 0 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/mediawiki/core
refs/changes/94/161994/1
diff --git a/includes/parser/Parser.php b/includes/parser/Parser.php
index 84bb224..8bd96b5 100644
--- a/includes/parser/Parser.php
+++ b/includes/parser/Parser.php
@@ -258,6 +258,21 @@
*/
public function __clone() {
$this->mInParse = false;
+
+ // Bug 56226: When you create a reference "to" an object field,
that
+ // makes the object field itself be a reference too (until the
other
+ // reference goes out of scope). When cloning, any field that's
a
+ // reference is copied as a reference in the new object. Both
of these
+ // are defined PHP5 behaviors, as inconvenient as it is for us
when old
+ // hooks from PHP4 days are passing fields by reference.
+ foreach ( array( 'mStripState', 'mVarCache' ) as $k ) {
+ // Make a non-reference copy of the field, then rebind
the field to
+ // reference the new copy.
+ $tmp = $this->$k;
+ $this->$k =& $tmp;
+ unset( $tmp );
+ }
+
wfRunHooks( 'ParserCloned', array( $this ) );
}
--
To view, visit https://gerrit.wikimedia.org/r/161994
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I9c600e9c0845b4fde0366126ce3809d74e2240b4
Gerrit-PatchSet: 1
Gerrit-Project: mediawiki/core
Gerrit-Branch: master
Gerrit-Owner: Anomie <[email protected]>
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