[U-Boot] [PATCH] fdt: Check if the FDT address is configured

[Jerry Van Baren <gvb.uboot@gmail.com>]

Hi Marek,

I'll queue this up this weekend.

The merge window for v2012.10 closed September 18.  Unless there is an
overriding urgency, the patch will go into the following release.

On 09/05/2012 02:34 AM, Marek Vasut wrote:
> In case the "fdt addr" command wasn't ran yet and any other "fdt"
> subcommand was issued, the system crashed due to NULL pointer being
> used.
> 
> This is caused by "fdt addr" command setting up a pointer to the
> FDT memory location. Prior issuing "fdt addr", the pointer is NULL
> so calling any other subcommands crashed the u-boot.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> ---
>  common/cmd_fdt.c |   13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> Note: Damn, I'm falling asleep already :-( I hope the text above at
>       least makes sense though.
> 
> diff --git a/common/cmd_fdt.c b/common/cmd_fdt.c
> index 9a5c53e..e2225c4 100644
> --- a/common/cmd_fdt.c
> +++ b/common/cmd_fdt.c
> @@ -114,10 +114,21 @@ int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
>  			}
>  		}
>  
> +		return CMD_RET_SUCCESS;
> +	}
> +
> +	if (!working_fdt) {
> +		puts(
> +			"No FDT memory address configured. Please configure\n"
> +			"the FDT address via \"fdt addr <address>\" command.\n"
> +			"Aborting!\n");
> +		return CMD_RET_FAILURE;
> +	}
> +
>  	/*
>  	 * Move the working_fdt
>  	 */
> -	} else if (strncmp(argv[1], "mo", 2) == 0) {
> +	if (strncmp(argv[1], "mo", 2) == 0) {
>  		struct fdt_header *newaddr;
>  		int  len;
>  		int  err;
> 

Thanks,
gvb