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Request #71734 mbfl_string only support unsigned int for string length
Submitted: 2016-03-07 22:04 UTC Modified: 2017-07-22 16:02 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:-1 (-100.0%)
From: yohgaki@php.net Assigned: nikic (profile)
Status: Closed Package: mbstring related
PHP Version: Next Minor Version OS: irrelevant
Private report: No CVE-ID: None
View Developer Edit
 [2016-03-07 22:04 UTC] yohgaki@php.net 
Description:
------------
mbstring's string is defined as follows

mbfl_string.h

/*
 * string object
 */
typedef struct _mbfl_string {
	enum mbfl_no_language no_language;
	enum mbfl_no_encoding no_encoding;
	unsigned char *val;
	unsigned int len;
} mbfl_string;

"unsigned int len" should be extended to "size_t len" to support 2GB> strings.

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 [2016-03-08 02:07 UTC] yohgaki@php.net 
Related commit
http://git.php.net/?p=php-src.git;a=commitdiff;h=89a43425072feda1fc5546aaaaa7be7737c4f197
 [2016-03-08 09:31 UTC] ab@php.net 
Thanks for the checks, Yasuo. This was brought up by Nikita here https://github.com/php/php-src/pull/810 as the PR was partially incompatible, so this issue was overseen.

For how to go with fixing this - IMHO I'd see an issue in just patching the bundled libmbfl. Instead a proper PR should go into https://github.com/moriyoshi/libmbfl . There will be for sure some incompatible places in libmbfl itself once size_t is used. But once it's in and we bundle a new version, we could just revert the patch you've linked. Though, unfortunately it seems that the libmbfl repo doesn't have much activity lately. 

Thanks.
 [2016-03-08 11:36 UTC] yohgaki@php.net 
s/support 2GB> strings/support 4GB> strings/
It's "unsigned int".

@anatol
I'll ping libmbfl developers if they can work on it. If not, I may.
 [2017-07-22 16:02 UTC] nikic@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: nikic
 [2017-07-22 16:02 UTC] nikic@php.net 
I've switched mbfl_string to use size_t in master.
 
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