[PATCH] ARM: bootm: Add lower bound check of kernel in SDRAM

[Sascha Hauer]

On Tue, Oct 27, 2020 at 09:17:54AM +0300, Alexander Shiyan wrote:
> In get_kernel_addresses(), we add the lower bound check of kernel position.
> Kernel address cannot be lower than SDRAM start.
> 
> Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
> ---
>  arch/arm/lib32/bootm.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/arch/arm/lib32/bootm.c b/arch/arm/lib32/bootm.c
> index ad807fb1d..28a645a9d 100644
> --- a/arch/arm/lib32/bootm.c
> +++ b/arch/arm/lib32/bootm.c
> @@ -114,10 +114,11 @@ static int get_kernel_addresses(size_t image_size,
>  		kaddr = mem_start + image_decomp_size;
>  
>  		/*
> -		 * Make sure we do not place the image past the end of the
> +		 * Make sure we do not place the image outside of the
>  		 * available memory.
>  		 */
> -		if (kaddr + image_size + spacing >= mem_end)
> +		if (((kaddr + image_size + spacing) > mem_end) &&
> +		    ((mem_end - image_size - spacing) >= mem_start))
>  			kaddr = mem_end - image_size - spacing;
>  
>  		*load_address = PAGE_ALIGN_DOWN(kaddr);
> -- 
> 2.26.2
> 
> 
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