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Bug #27295 Memory Leak with sscanf
Submitted: 2004-02-17 15:14 UTC Modified: 2004-02-18 14:42 UTC
From: jwalker7281 at yahoo dot com Assigned: iliaa (profile)
Status: Closed Package: Scripting Engine problem
PHP Version: 4CVS, 5CVS OS: Redhat Linux 9
Private report: No CVE-ID: None
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From: jwalker7281 at yahoo dot com
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 [2004-02-17 15:14 UTC] jwalker7281 at yahoo dot com
I found that using sscanf, at least within a foreach loop, leaks. The original code I found this in read in a file, and then did foreach( $lines as $line )... I wrote a small bit of code to simulate that. It doesn't give the same files for a leak location, but it still leaks.

When running my code, I got this:
/root/php-5.0.0b4/Zend/zend_execute.c(2973) :  Freeing 0x40232D30 (2 bytes), script=./objtest
/root/php-5.0.0b4/Zend/zend_variables.c(137) : Actual location (location was relayed)
=== Total 1 memory leaks detected ===

When running this test simulation code, I got this:
/root/php-5.0.0b4/ext/standard/scanf.c(937) :  Freeing 0x4022727C (4 bytes), script=./memleak
=== Total 1 memory leaks detected ===

Both are running PHP5, b4 in CLI mode.

Reproduce code:
#!/usr/local/bin/php -q
   $strings = array( "#dude = me\n", "#bug = nasty\n" );
   foreach( $strings as $string )
      sscanf( $string, "%s = %[^[]]", $var, $val );
      echo "$var = $val\n";

Expected result:
It *works*, as in it outputs:

#dude = me

#bug = nasty

But it also gives that memory leak bug.

Actual result:
Please see above.


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 [2004-02-18 14:42 UTC]
This bug has been fixed in CVS.

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