Hi Lennert,
On Mon, Jan 7, 2013 at 1:48 PM, Lennert Buytenhek
<buytenh@xxxxxxxxxxxxxx> wrote:
> On Sun, Jan 06, 2013 at 08:27:22PM -0500, Nickolai Zeldovich wrote:
>
>> Do not dereference p->station_id after kfree(cmd) because p
>> points into the cmd data structure.
>
> Good catch, but the patch would be better titled "mwl8k.c: avoid
> having a working driver", as the station_id return code _is_ needed
> by the caller in case of success.
Are you sure?
>> diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
>> index f221b95..83564d3 100644
>> --- a/drivers/net/wireless/mwl8k.c
>> +++ b/drivers/net/wireless/mwl8k.c
>> @@ -4250,9 +4250,11 @@ static int mwl8k_cmd_update_stadb_add(struct ieee80211_hw *hw,
>> p->amsdu_enabled = 0;
>>
>> rc = mwl8k_post_cmd(hw, &cmd->header);
>> + if (!rc)
>> + rc = p->station_id;
>> kfree(cmd);
>>
>> - return rc ? rc : p->station_id;
If I'm reading this right, the removed line is equivalent to:
if( rc )
return rc;
else
return p->station_id;
which is equivalent to:
if( !rc )
rc = p->station_id;
return rc;
Thanks,
--
Julian Calaby
Email: julian.calaby@xxxxxxxxx
Profile: http://www.google.com/profiles/julian.calaby/
.Plan: http://sites.google.com/site/juliancalaby/
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