[patch 1/2] gpu: host1x: fix an integer overflow check

[Thierry Reding]

On Fri, Aug 23, 2013 at 01:18:25PM +0300, Dan Carpenter wrote:
> Tegra is a 32 bit arch.  On 32 bit systems then size_t is 32 bits so
> "total" will never be higher than UINT_MAX because of integer overflows.
> We need cast to u64 first before doing the math.
> 
> Also the addition earlier:
> 
>         unsigned int num_unpins = num_cmdbufs + num_relocs;
> 
> That can overflow as well, but I think it's still safe because we check
> both "num_cmdbufs" and "num_relocs" again in this test.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> ---
> This is something I spotted in code review.  I can't actually compile
> this code.  I assume this overflow test has security implications.

It did compile and looks good to me, so I've applied it.

Thanks,
Thierry
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