[U-Boot] [PATCH 4/5 V2] NAND: Make page, erase, oob size available via cmd_nand

[Scott Wood]

On 09/27/2011 03:07 PM, Marek Vasut wrote:
> On Tuesday, September 27, 2011 09:51:09 PM Scott Wood wrote:
>> On 09/27/2011 02:38 PM, Marek Vasut wrote:
>>> On Tuesday, September 27, 2011 09:01:53 PM Scott Wood wrote:
>>>> On Thu, Sep 22, 2011 at 03:57:26AM +0200, Marek Vasut wrote:
>>>>> +	/* Set geometry info */
>>>>> +	memset(buf, 0, bufsz);
>>>>> +	sprintf(buf, "%x", nand->writesize);
>>>>> +	setenv("nand_writesize", buf);
>>>>> +
>>>>> +	memset(buf, 0, bufsz);
>>>>> +	sprintf(buf, "%x", nand->oobsize);
>>>>> +	setenv("nand_oobsize", buf);
>>>>> +
>>>>> +	memset(buf, 0, bufsz);
>>>>> +	sprintf(buf, "%x", nand->erasesize);
>>>>> +	setenv("nand_erasesize", buf);
>>>>
>>>> Why the memsets?
>>>
>>> To clear the memory from previous usage ?
>>
>> What part of the previous usage will both survive the sprintf() and be
>> looked at by setenv()?
> 
> The part of data that are copied in _do_set_env() ?

I don't see _do_set_env anywhere -- what tree are you looking at?

In any case, sprintf() produces a zero-terminated string.  setenv()
consumes a zero-terminated string.  setenv() doesn't even know that the
buffer containing the string happens to be 32 bytes, much less have any
business poking around in that area.

-Scott