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[Bug libc/11701] New: off-by-one error in group_member()


group_member does:
 
    while (n >= 0)
        if (groups[n--] == gid)
            return 1;

with n being the number of groups. Thus groups[n] to groups[0] are accessed
instead of groups[n-1] to groups[0].

-- 
           Summary: off-by-one error in group_member()
           Product: glibc
           Version: 2.12
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: aurelien at aurel32 dot net
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11701

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