[lm-sensors] [PATCH] hwmon: (applesmc) Fix checkpatch errors
rydberg at euromail.se
Wed Nov 10 20:56:20 CET 2010
>>> @@ -977,7 +975,11 @@ static ssize_t applesmc_key_at_index_show
>>> static ssize_t applesmc_key_at_index_store(struct device *dev,
>>> struct device_attribute *attr, const char *sysfsbuf, size_t count)
>>> - key_at_index = simple_strtoul(sysfsbuf, NULL, 10);
>>> + unsigned long newkey;
>>> + if (strict_strtoul(sysfsbuf, 10, &newkey) < 0)
>>> + return -EINVAL;
>>> + key_at_index = newkey;
>> Crash alert - key_at_index is not range checked, and the remake uses this value
>> as an array index...
> Good that I made this change ;). I'll add the check and re-send.
Indeed! The downside of remakes... sorry about that. :-)
I guess the change should go into patch 4 already? There is also the option to
put the bounds check in applesmc_get_entry_by_index, but I like the simplicity
of "|| newkey >= smcreg.key_count".
> This points to another problem, though. You allocate key_count entries,
> ie cache..cache[key_count-1]. Yet, the key searches are from 0..key_count,
> ie span key_count+1 entries. Is that another problem ?
> Seems to me you would either have to allocate key_count+1 entries, or terminate
> the search at key_count - 1. Not sure which one would be correct. Let me know,
> and I'll update the affected patch(es).
If you are referring to the lower and upper bound functions, those use the
one-past-the-last-element convention, so it is actually still 0..key_count - 1.
I stayed very close to the stl reference implementation, which relies on the
fact that when begin != end, (begin + (end - begin) / 2) < end.
More information about the lm-sensors