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ext/session: fix missing zval_ptr_dtor for retval in PS_GC_FUNC(user) #21747

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ext/session: fix missing zval_ptr_dtor for retval in PS_GC_FUNC(user) #21747

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ext/session: fix missing zval_ptr_dtor for retval in PS_GC_FUNC(user)
jorgsowa Apr 14, 2026
5d0879e
ext/session: prevent string interning in gc retval leak test
jorgsowa Apr 20, 2026
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1 change: 1 addition & 0 deletions ext/session/mod_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -218,6 +218,7 @@ PS_GC_FUNC(user)
/* Anything else is some kind of error */
*nrdels = -1; // Error
}
zval_ptr_dtor(&retval);
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@ndossche ndossche Apr 16, 2026

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Why not only do this in the error case?
Besides there's a subtle additional problem in the callback code: it doesn't handle reference returns (this may be solved in ps_call_handler).

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@jorgsowa jorgsowa Apr 21, 2026

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Thank you for this comment. I need to still apply it, but in different PR. CC: @Girgias this hasn't been addressed yet, but I think it may be addressed in differnt PR

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@Girgias Girgias Apr 21, 2026

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Right, but that is a different bug so indeed can be done in a different PR.

It might make sense to have a way to test all callbacks if they return references as this seems to be quite a common bug.

return *nrdels;
}

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33 changes: 33 additions & 0 deletions ext/session/tests/user_session_module/gh_gc_retval_leak.phpt
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@@ -0,0 +1,33 @@
--TEST--
session_gc(): user handler returning non-bool/non-int does not leak memory
--INI--
session.gc_probability=0
session.save_handler=files
--EXTENSIONS--
session
--FILE--
<?php
ob_start();

// Procedural API has no return type enforcement, so gc can return a string
// (reference-counted), which PS_GC_FUNC(user) previously did not free.
session_set_save_handler(
function(string $path, string $name) { return true; },
function() { return true; },
function(string $id): string|false { return ""; },
function(string $id, string $data) { return true; },
function(string $id) { return true; },
function(int $max) { return str_repeat("x", random_int(100, 100)); }
);

session_start();
$result = session_gc();
var_dump($result);
session_write_close();

ob_end_flush();
?>
--EXPECTF--

Deprecated: session_set_save_handler(): Providing individual callbacks instead of an object implementing SessionHandlerInterface is deprecated in %s on line %d
bool(false)
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