Please do not call zval_dtor on recursive array

Hi:
it's great, I tested, and committed. :)

thanks

I think, I've found a more simple fix (attached) that don't require
extension patching and even allow to optimize ZE a bit.

Laruence, can you please verify it.
Sorry, I'm quite busy with other tasks.

Thanks. Dmitry.

hi Dmitry, Laruence!

Hey:

recently we found a problem, that is "usage zval_dtor on a recursive
array while gc enabled" has chance to result a segfault.

a reproduce script could be found here:

https://github.com/php/php-src/blob/8bd5e15ff7a57791956c4017ee8fb4a8ac0d8d2e/ext/pcre/tests/bug63055.phpt

the preg_match used to call zval_dtor on the third argument. which
result a segfault, reported at #63055

the segfault backtrace will looks like: http://pastebin.com/uPWBgrTZ

thanks to dmitry, we got a simple solution, that is: instead of
directly call to zval_dtor, please use following codes instead:
"
zval garbage = *subpats;
array_init(subpats);
zval_dtor(&garbage);
"

Nice catch!

We could add a macro? As it looks like many will forget to do that :)

maybe a seris macro:

ZVAL_REPLACE_LONG()
ZVAL_REPLACE_STRING{L}()
ZVAL_REPLACE_ZVAL()

etc;

thanks , will do it later, only for trunk I think

thanks

Cheers,

Pierre

@pierrejoye | http://blog.thepimp.net | http://www.libgd.org

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