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Fixed #74977 - Appending AppendIterator leads to segfault #2651

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Fixed #74977 - Appending AppendIterator leads to segfault #2651

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7 changes: 6 additions & 1 deletion ext/spl/spl_iterators.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3366,7 +3366,7 @@ SPL_METHOD(AppendIterator, __construct)
Append an iterator */
SPL_METHOD(AppendIterator, append)
{
spl_dual_it_object *intern;
spl_dual_it_object *intern, *appender;
zval *it;

SPL_FETCH_AND_CHECK_DUAL_IT(intern, getThis());
Expand All @@ -3378,6 +3378,11 @@ SPL_METHOD(AppendIterator, append)
spl_array_iterator_append(&intern->u.append.zarrayit, it);
intern->u.append.iterator->funcs->move_forward(intern->u.append.iterator);
}else{
appender = Z_SPLDUAL_IT_P(it);
if (appender->dit_type == DIT_AppendIterator) {
spl_array_iterator_append(&intern->u.append.zarrayit, &appender->u.append.zarrayit);
return;
}
spl_array_iterator_append(&intern->u.append.zarrayit, it);
}

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13 changes: 13 additions & 0 deletions ext/spl/tests/bug74977.phpt
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@@ -0,0 +1,13 @@
--TEST--
Bug #74977: Recursion leads to crash
--FILE--
<?php

$iterator = new AppendIterator(array("A","A","A"));
$iterator->append($iterator);
var_dump($iterator);
?>
--EXPECTF--
object(AppendIterator)#1 (0) {
}