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Bug #26042 Memory usage
Submitted: 2003-10-30 10:41 UTC Modified: 2003-10-30 23:33 UTC
From: vsv3 at alu dot ua dot es Assigned:
Status: Closed Package: mcrypt related
PHP Version: 4CVS, 5CVS OS: Linux 2.4.22 Debian Woody
Private report: No CVE-ID: None
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Bug Type:
From: vsv3 at alu dot ua dot es
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 [2003-10-30 10:41 UTC] vsv3 at alu dot ua dot es
When I use the functions for encrypt some data, the memory that PHP uses, doesn't get free. It gets more and more memory.

Reproduce code:
$key = '123456789012345678901234567890';
$iv  = '12345678';

$nVeces = 100000;
$n = 0;
$td = mcrypt_module_open( MCRYPT_BLOWFISH, '', MCRYPT_MODE_CBC, '' );
while( $n < $nVeces ) {
	$fichero = file_get_contents( "/tmp/hola" );

	mcrypt_generic_init( $td, $key, $iv );
	$fichero_enc = addslashes( mcrypt_generic($td, $textoPlano) );
	unset( $fichero_enc );

	if( isset($fichero_enc) ) echo "<b><h1>No pudimos destruir la variable</h1></b><br />";
	$n = $n + 1;
mcrypt_module_close( $td );

Expected result:
A script that execute with a consume of less than 1MB of memory (with a file '/tmp/hola' of 1kB).

Actual result:
An script that consumes more than 100MB, or more. A similar script with other data, have been consumed more than 2000MB.


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 [2003-10-30 18:06 UTC]
Looks like a leak starting in mcrypt_generic_init(). When 
mcrypt_generic_init() is called from PHP userland, it 
never gets deinit'd unless you explicitly call 
Perhaps mcrypt_generic_init() should check to see if the 
td has already been init'd and if so, deinit it first. 
Haven't looked too closely at the libmcrypt source yet to 
see the easiest way to do it.  
This is using libmcrypt 2.5.7 and an up-to-date 4_3.  
 [2003-10-30 23:33 UTC]
This bug has been fixed in CVS.

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Fixed in 5.0, will be fixed in 4.X after 4.3.4 release.
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