[U-Boot] env: fix potential stack overflow in environment functions

[Tom Rini]

On Fri, Mar 22, 2013 at 11:26:21AM -0000, Rob Herring wrote:

> From: Rob Herring <rob.herring at calxeda.com>
> 
> Most of the various environment functions create CONFIG_ENV_SIZE buffers on
> the stack. At least on ARM and PPC which have 4KB stacks, this can overflow
> the stack if we have large environment sizes. So move all the buffers off
> the stack to static buffers.
> 
> Signed-off-by: Rob Herring <rob.herring at calxeda.com>

Applied to u-boot/master, thanks!

-- 
Tom
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