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Bug #54598 bcpowmod() may return 1 if modulus is 1
Submitted: 2011-04-24 16:15 UTC Modified: 2017-09-06 22:06 UTC
Votes:3
Avg. Score:3.7 ± 0.9
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: okano1220 at gmail dot com Assigned: cmb (profile)
Status: Closed Package: BC math related
PHP Version: 5.3.6 OS: linux,windows
Private report: No CVE-ID: None
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 [2011-04-24 16:15 UTC] okano1220 at gmail dot com 
Description:
------------
when setting bcpowmod 2nd parameter $right_operand to 0 and setting  3rd parameter $modulous to 1, bcpowmod returns 1.

Ofcourse expected value is 0.

Test script:
---------------
<?php echo bcpomod(5,0,1); // 5**0%1

Expected result:
----------------
0

Actual result:
--------------
1

Patches

20110424bcpowmod_okano (last revision 2011-04-24 14:18 UTC by okano1220 at gmail dot com)

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 [2017-09-06 22:06 UTC] cmb@php.net
-Summary: when exp is 0 ,bcpowmod returns 1 ,even if modulous is 1 +Summary: bcpowmod() may return 1 if modulus is 1 -Status: Open +Status: Analyzed -Assigned To: +Assigned To: cmb
 [2017-09-06 22:06 UTC] cmb@php.net 
Thanks for reporting this issue and providing an appropriate
patch!

And sorry for the long delay!
 [2017-09-06 22:50 UTC] cmb@php.net 
Automatic comment on behalf of cmbecker69@gmx.de
Revision: http://git.php.net/?p=php-src.git;a=commit;h=b2919853f867ca7948e1c80c48eb868eae4ba882
Log: Fixed bug #54598 (bcpowmod() may return 1 if modulus is 1)
 [2017-09-06 22:50 UTC] cmb@php.net
-Status: Analyzed +Status: Closed
 
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