[U-Boot] cmd_mem: cleanups, catch bad usage

Currently, memtest will silently accept bad data. Perform error
checking on user intput.

Signed-off-by: Pavel Machek <pavel@denx.de>

On Wed 2015-04-01 13:50:41, Pavel Machek wrote:
> Currently, memtest will silently accept bad data. Perform error
> checking on user intput.
> 
> Signed-off-by: Pavel Machek <pavel@denx.de>

Ping? Tom, noone replys here, can you take the patch?

> diff --git a/common/cmd_mem.c b/common/cmd_mem.c
> index bfca59e..e6623b0 100644
> --- a/common/cmd_mem.c
> +++ b/common/cmd_mem.c
> @@ -994,10 +994,10 @@ static int do_mem_mtest(cmd_tbl_t *cmdtp, int flag, int argc,
>  {
>  	ulong start, end;
>  	vu_long *buf, *dummy;
> -	int iteration_limit;
> +	int iteration_limit = 0;
>  	int ret;
>  	ulong errs = 0;	/* number of errors, or -1 if interrupted */
> -	ulong pattern;
> +	ulong pattern = 0;
>  	int iteration;
>  #if defined(CONFIG_SYS_ALT_MEMTEST)
>  	const int alt_test = 1;
> @@ -1005,25 +1005,29 @@ static int do_mem_mtest(cmd_tbl_t *cmdtp, int flag, int argc,
>  	const int alt_test = 0;
>  #endif
>  
> +	start = CONFIG_SYS_MEMTEST_START;
> +	end = CONFIG_SYS_MEMTEST_END;
> +
>  	if (argc > 1)
> -		start = simple_strtoul(argv[1], NULL, 16);
> -	else
> -		start = CONFIG_SYS_MEMTEST_START;
> +		if (strict_strtoul(argv[1], 16, &start) < 0)
> +			return CMD_RET_USAGE;
>  
>  	if (argc > 2)
> -		end = simple_strtoul(argv[2], NULL, 16);
> -	else
> -		end = CONFIG_SYS_MEMTEST_END;
> +		if (strict_strtoul(argv[2], 16, &end) < 0)
> +			return CMD_RET_USAGE;
>  
>  	if (argc > 3)
> -		pattern = (ulong)simple_strtoul(argv[3], NULL, 16);
> -	else
> -		pattern = 0;
> +		if (strict_strtoul(argv[3], 16, &pattern) < 0)
> +			return CMD_RET_USAGE;
>  
>  	if (argc > 4)
> -		iteration_limit = (ulong)simple_strtoul(argv[4], NULL, 16);
> -	else
> -		iteration_limit = 0;
> +		if (strict_strtoul(argv[4], 16, &iteration_limit) < 0)
> +			return CMD_RET_USAGE;
> +
> +	if (end < start) {
> +		printf("Refusing to do empty test\n");
> +		return -1;
> +	}
>  
>  	printf("Testing %08x ... %08x:\n", (uint)start, (uint)end);
>  	debug("%s:%d: start %#08lx end %#08lx\n", __func__, __LINE__,
> @@ -1074,7 +1078,7 @@ static int do_mem_mtest(cmd_tbl_t *cmdtp, int flag, int argc,
>  		ret = errs != 0;
>  	}
>  
> -	return ret;	/* not reached */
> +	return ret;
>  }
>  #endif	/* CONFIG_CMD_MEMTEST */
>  
>

On Wed, Apr 01, 2015 at 01:50:41PM +0200, Pavel Machek wrote:

> Currently, memtest will silently accept bad data. Perform error
> checking on user intput.
> 
> Signed-off-by: Pavel Machek <pavel@denx.de>
> 
> diff --git a/common/cmd_mem.c b/common/cmd_mem.c
> index bfca59e..e6623b0 100644

Applied to u-boot/master, thanks!