On 08/01/2014 08:31 AM, Hannes Reinecke wrote:
> On 08/01/2014 12:32 AM, Mike Christie wrote:
>> On 07/30/2014 07:50 AM, Hannes Reinecke wrote:
>>> On 07/12/2014 10:51 PM, micha...@cs.wisc.edu wrote:
>>>> From: Mike Christie <micha...@cs.wisc.edu>
>>>>
>>>> iscsi_get_host_stats was dropping the error code returned
>>>> by drivers like qla4xxx.
>>>>
>>>> Signed-off-by: Mike Christie <micha...@cs.wisc.edu>
>>>> ---
>>>> drivers/scsi/scsi_transport_iscsi.c | 4 ++++
>>>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/drivers/scsi/scsi_transport_iscsi.c
>>>> b/drivers/scsi/scsi_transport_iscsi.c
>>>> index b481e62..14bfa53 100644
>>>> --- a/drivers/scsi/scsi_transport_iscsi.c
>>>> +++ b/drivers/scsi/scsi_transport_iscsi.c
>>>> @@ -3467,6 +3467,10 @@ iscsi_get_host_stats(struct iscsi_transport
>>>> *transport, struct nlmsghdr *nlh)
>>>> memset(buf, 0, host_stats_size);
>>>>
>>>> err = transport->get_host_stats(shost, buf,
>>>> host_stats_size);
>>>> + if (err) {
>>>> + kfree(skbhost_stats);
>>>> + goto exit_host_stats;
>>>> + }
>>>>
>>>> actual_size = nlmsg_total_size(sizeof(*ev) +
>>>> host_stats_size);
>>>> skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
>>>>
>>> What happens with the skbhost_stats allocated earlier? Shouldn't it be
>>> freed here, too?
>>>
>>
>> You mean for this success path right. It is not freed here by the iscsi
>> code on purpose. For the code path here where we have successfully
>> called into the driver then a couple lines below we will do
>>
>> iscsi_multicast_skb() -> nlmsg_multicast()
>>
>> which will pass the skbhost_stats skb to the netlink layer. The
>> netlink/socket/skb code then frees it when it is done with it.
>>
> No, I meant the failure path.
>
> You do an alloc_skb above, then get_host_stats failed, and you exit the
> function without freeing the skb.
Ah, actually I am freeing it, but I now realize with the wrong function,
so I think that is why I was confused by your comment. Above I added a
kfree() of the skb. I should be using kfree_skb. Will fix it up. Thanks.
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