[asterisk-bugs] [JIRA] (ASTERISK-20858) app_minivm fails to clean up mkstemp files

[Friendly Automation (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=238287#comment-238287 ] 

Friendly Automation commented on ASTERISK-20858:
------------------------------------------------

Change 6314 merged by Jenkins2:
voicemail: Fix various abuses of mkstemp

[https://gerrit.asterisk.org/6314|https://gerrit.asterisk.org/6314]

> app_minivm fails to clean up mkstemp files
> ------------------------------------------
>
>                 Key: ASTERISK-20858
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20858
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Applications/app_minivm
>            Reporter: Walter Doekes
>            Severity: Minor
>
> Matt recently touched this code and removed a comment about leaking fd's and files.
> {noformat}
> tmpfd = mkstemp(newtmp);
> if (tmpfd < 0) {
>         ast_log(LOG_WARNING, "Failed to create temporary file for volgain: %d\n", errno);
>         ast_free(str1);
>         ast_free(str2);
>         return -1;
> }
> snprintf(tmpcmd, sizeof(tmpcmd), "sox -v %.4f %s.%s %s.%s", vmu->volgain, filename, format, newtmp, format);
> ast_safe_system(tmpcmd);
> {noformat}
> The fd leaks may be gone, but this looks like:
> (a) file leaks
> (b) misuse of mkstemp by appending format to the filename
> First we have mkstemp create an actual file "/tmp/ABCDEF" and then we write to "/tmp/ABCDEF.wav". No one cares about the original "/tmp/ABCDEF" on disk, and by writing to "/tmp/ABCDEF.wav" you're ignoring most of the functionality of mkstemp -- being secure and not overwriting existing files.
> Lastly, no one ever clears up fname (finalfilename.format), resulting in a second file leak.



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