[Bug 16318] New: checking the value of errno without resetting it first

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=16318

            Bug ID: 16318
           Summary: checking the value of errno without resetting it first
           Product: Busybox
           Version: 1.37.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: bmburstein at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 9823
  --> https://bugs.busybox.net/attachment.cgi?id=9823&action=edit
patch to fix

In the file libpwdgrp/pwd_grp.c the function `massage_data_for_r_func` returns
`errno` to indicate success/failure, but does not ensure that errno is set to
zero beforehand. This can cause a situation where the function succeeded, but
it returns a non-zero value (indicating a failure). This happens if errno was
not zero when entering the function.

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