2014-10-16 20:25 GMT+02:00 Jason Cooper <ja...@lakedaemon.net>:
> On Thu, Oct 16, 2014 at 08:15:55PM +0200, Rickard Strandqvist wrote:
>> The buf is used to hold the list of hwrng devices registered.
>> The old code ensures we don't walk off the end of buf as we
>> fill it, but it's unnecessarily complicated and thus difficult
>> to maintain. Simplify it by using strlcat.
>
>> We also ensure the string within buf is NULL terminated
>> so the final strlen is ok.
>
> This text is no longer necessary.
>
>>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqv...@spectrumdigital.se>
>
> Please add my:
>
> Reviewed-by: Jason Cooper <ja...@lakedaemon.net>
>
> to the next version of this patch. It makes the maintainers job a *lot*
> easier not having to sift through old threads collecting up all the
> tags.
>
> thx,
>
> Jason.
>
>> ---
>> drivers/char/hw_random/core.c | 11 ++++-------
>> 1 file changed, 4 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
>> index aa30a25..25599ea 100644
>> --- a/drivers/char/hw_random/core.c
>> +++ b/drivers/char/hw_random/core.c
>> @@ -281,7 +281,7 @@ static ssize_t hwrng_attr_available_show(struct device
>> *dev,
>> char *buf)
>> {
>> int err;
>> - ssize_t ret = 0;
>> + ssize_t ret;
>> struct hwrng *rng;
>>
>> err = mutex_lock_interruptible(&rng_mutex);
>> @@ -289,13 +289,10 @@ static ssize_t hwrng_attr_available_show(struct device
>> *dev,
>> return -ERESTARTSYS;
>> buf[0] = '\0';
>> list_for_each_entry(rng, &rng_list, list) {
>> - strncat(buf, rng->name, PAGE_SIZE - ret - 1);
>> - ret += strlen(rng->name);
>> - strncat(buf, " ", PAGE_SIZE - ret - 1);
>> - ret++;
>> + strlcat(buf, rng->name, PAGE_SIZE);
>> + strlcat(buf, " ", PAGE_SIZE);
>> }
>> - strncat(buf, "\n", PAGE_SIZE - ret - 1);
>> - ret++;
>> + ret = strlcat(buf, "\n", PAGE_SIZE);
>> mutex_unlock(&rng_mutex);
>>
>> return ret;
>> --
>> 1.7.10.4
>>
Hello again
I was not sure how I would do with others Reviewed-by:
But then I know it, did not seem obvious to do, because I actually
change some code in between.
And I also think about my change, which is actually wrong with using
the return value from strlcat the same reason as I mentioned before,
it can return strlen + 1
So sorry Joe, I do not think we even can do that :-(
So back to my previous patch then, also I update the text again.
Kind regards
Rickard Strandqvist
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
