[U-Boot] cmd/pxe.c: Rework initrd and bootargs handling slightly

[Tom Rini]

On Tue, Sep 26, 2017 at 08:44:32PM -0400, Tom Rini wrote:

> For the initrd portion of handling our bootm arguments we do not have a
> sufficiently long enough buffer for some improbable 64bit cases.  Expand
> this buffer to allow for a 64bit address and almost 256MB initrd to be
> used.  Make use of strncpy/strncat when constructing the values here
> since we know what the worst case valid values are, length wise.
> 
> Similarly for bootargs themselves, we need to make use of strlen/sizeof
> and strncpy/strncat to ensure that we don't overflow bootargs itself.
> 
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Alexander Graf <agraf at suse.de>
> Reported-by: Coverity (CID: 131256)
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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