[Bug libc/17273] New: getmntent() returns wrong default value for fs_passno

["naszar at ya dot ru" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17273

            Bug ID: 17273
           Summary: getmntent() returns wrong default value for fs_passno
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: naszar at ya dot ru
                CC: drepper.fsp at gmail dot com

Created attachment 7747
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7747&action=edit
simple test program

man 5 fstab states that if the fifth field (fs_freq) and the sixth field
(fs_passno) is not present a value of zero is returned (i.q.
fs_req=0,fs_passno=0 if there is no fifth and sixth field in /etc/fstab  line).
If fourth field ends with '\n' all work fine. But if there is extra tabs or
spaces getmntent() returns garbage in ((struct mntent *) mp)->mnt_passno. It is
because in misc/mntent_r.c:__getmntent_r() at line 167 no checks that sscanf()
returns EOF or no striping for spaces and tabs like it done at line 164 for
example.
In my mashine attached test_mntent (for testtab which also attached) say:
mnt_dir=/home    mnt_freq=42    mnt_passno=666
mnt_dir=/home    mnt_freq=42    mnt_passno=666
but must:
mnt_dir=/home    mnt_freq=42    mnt_passno=666
mnt_dir=/home    mnt_freq=0    mnt_passno=0

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