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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COMPRESS-421) TarUtils.parseName does not follow the spec
Date Fri, 06 Oct 2017 17:13:00 GMT

    [ https://issues.apache.org/jira/browse/COMPRESS-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16194875#comment-16194875
] 

ASF GitHub Bot commented on COMPRESS-421:
-----------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/commons-compress/pull/54


> TarUtils.parseName does not follow the spec
> -------------------------------------------
>
>                 Key: COMPRESS-421
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-421
>             Project: Commons Compress
>          Issue Type: Bug
>          Components: Archivers
>    Affects Versions: 1.4, 1.14
>            Reporter: Roel Spilker
>            Priority: Minor
>             Fix For: 1.15
>
>         Attachments: foo.tar.gz
>
>
> TarUtils.parseName does not stop at the first NUL byte, resulting in non-empty strings
where they should be empty.
> This manifests if the tar file contains a star_header struct instead of a posix_header
as defined in https://www.gnu.org/software/tar/manual/html_node/Standard.html
> The javadoc on parseName states "Parse an entry name from a buffer. Parsing stops when
a NUL is found or the buffer length is reached."
> However, the implementation starts at the end of the buffer and stops when the first
non-NUL is found.
> The solution is to replace:
> {code:java}
>   int len = length;
>   for (; len > 0; len--) {
>     if (buffer[offset + len - 1] != 0) {
>       break;
>     }
>   }
> {code}
> by
> {code:java}
>   int len = 0;
>   for (int i = offset; len < length && buffer[i] != 0; i++, len++);
> {code}
> This has been introduce in commit https://git-wip-us.apache.org/repos/asf?p=commons-compress.git;a=commitdiff;h=69ceb4e14feb6273c06c1e35ba116b6783bb3278




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