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The following sequence of actions was happening which caused a null pointer dereference: 1. debug_backtrace() returns an array 2. The concatenation to $c will transform the array to a string via `zval_get_string_func` for op2 and output a warning. Note that zval op1 is of type string due to the first do-while sequence. 3. The warning of an implicit "array to string conversion" triggers the ob_start callback to run. This code transform $c (==op1) to a long. 4. The code below the 2 do-while sequences assume that both op1 and op2 are strings, but this is no longer the case. A dereference of the string will therefore result in a null pointer dereference. The solution used here is to work with the zend_string directly instead of with the ops. For the tests: Co-authored-by: changochen1@gmail.com Co-authored-by: cmbecker69@gmx.de Co-authored-by: yukik@risec.co.jp Closes GH-10049.
17 lines
227 B
PHP
17 lines
227 B
PHP
--TEST--
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Test concatenating a class instance that has __toString with itself
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--FILE--
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<?php
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class Tmp {
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public function __toString() {
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return "abc";
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}
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}
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$tmp = new Tmp;
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$tmp .= $tmp;
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echo $tmp . "\n";
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?>
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--EXPECT--
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abcabc
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