Re: Taking strlen of buffers copied from userspace

[Robert Hancock <hancockr@shaw.ca>]

Randy.Dunlap wrote:
> The latter one does (before the listed code):
> 
>     memset(line, 0, LINE_SIZE);
>     if (len > LINE_SIZE)
>         len = LINE_SIZE;
>     if (copy_from_user(line, buf, len - 1))
>         return -EFAULT;
> 
> so isn't line[LINE_SIZE - 1] always 0 ?

In that case, yes (I hadn't looked at the surrounding code). Rather an 
odd way of doing it, but shouldn't have that problem. Could still be 
subject to problems if buf contains a null at the first character, 
unless they're somehow preventing that too..

-- 
Robert Hancock      Saskatoon, SK, Canada
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