PHP :: Bug #61764 :: output of unpack while 'I' used

Bug #61764	output of unpack while 'I' used
Submitted:	2012-04-18 13:32 UTC	Modified:	2012-04-24 09:46 UTC
From:	pgajdos at suse dot com	Assigned:	cataphract (profile)
Status:	Closed	Package:	Unknown/Other Function
PHP Version:	5.3.10	OS:	Linux
Private report:	No	CVE-ID:	None

View Developer Edit

[2012-04-18 13:32 UTC] pgajdos at suse dot com

Description:
------------
php -r "print_r(unpack('I', pack('I', -30000)));

gives 4294937296 on s390x but -30000 on x86_64. According to manual I think correct value should be 4294937296 on x86_64. Also perl returns this number for
perl -e "print unpack('I', pack('I', -30000))" for these two architectures.

Or have I misunderstood something?

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[2012-04-20 07:47 UTC] cataphract@php.net

Verified. If PHP can represent the unpacked unsigned number with its integer type, it should never return a negative number.

The result of pack() is correct:

http://www.wolframalpha.com/input/?i=%28-30000+mod+2%5E32%29+in+hex

ffff8ad0_16
$ php -r "print_r(unpack('H*', pack('I', -30000)));"
Array
(
    [1] => d08affff
)

[2012-04-20 07:47 UTC] cataphract@php.net

-Status: Open +Status: Assigned -Assigned To: +Assigned To: cataphract

[2012-04-23 21:11 UTC] cataphract@php.net

Automatic comment on behalf of cataphract
Revision: http://git.php.net/?p=php-src.git;a=commit;h=8d748e5de519867d9b6ce40e3ea28a209b07768f
Log: Fixed bug #61764: 'I' unpacks n as signed if n &gt; 2^31-1 on LP64

[2012-04-24 09:29 UTC] cataphract@php.net

This bug has been fixed in SVN.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
Thank you for the report, and for helping us make PHP better.

[2012-04-24 09:29 UTC] cataphract@php.net

-Status: Assigned +Status: Closed

[2012-04-24 09:46 UTC] pgajdos at suse dot com

Thanks for your quick fix.

[2014-10-07 23:26 UTC] stas@php.net

Automatic comment on behalf of cataphract
Revision: http://git.php.net/?p=php-src-security.git;a=commit;h=8d748e5de519867d9b6ce40e3ea28a209b07768f
Log: Fixed bug #61764: 'I' unpacks n as signed if n &gt; 2^31-1 on LP64

[2014-10-07 23:37 UTC] stas@php.net

Automatic comment on behalf of cataphract
Revision: http://git.php.net/?p=php-src-security.git;a=commit;h=8d748e5de519867d9b6ce40e3ea28a209b07768f
Log: Fixed bug #61764: 'I' unpacks n as signed if n &gt; 2^31-1 on LP64

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