Re: [PATCHv3]Checks for Null value in function *get_skub

[Steve Wise <swise@opengridcomputing.com>]

On 6/16/2014 10:14 AM, Nick Krause wrote:
> >From what I know yes so I would close the bug at the the link in
> my previous email and just void my patch.
> Cheers Nick

We shouldn't be kfree-ing an skb anyway.  Should use kfree_skb().

There is still a leak if skb is non-null and the skb is non linear or 
cloned.


> On Mon, Jun 16, 2014 at 11:12 AM, Levente Kurusa <levex@linux.com> wrote:
>> On 06/16/2014 05:08 PM, Nicholas Krause wrote:
>>> Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
>>> ---
>>>    drivers/infiniband/hw/cxgb4/cm.c | 8 +++-----
>>>    1 file changed, 3 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/infiniband/hw/cxgb4/cm.c
>>> b/drivers/infiniband/hw/cxgb4/cm.c
>>> index f9477e2..2d56983 100644
>>> --- a/drivers/infiniband/hw/cxgb4/cm.c
>>> +++ b/drivers/infiniband/hw/cxgb4/cm.c
>>> @@ -340,15 +340,13 @@ static int status2errno(int status)
>>>     */
>>>    static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp)
>>>    {
>>>    if (skb && !skb_is_nonlinear(skb) && !skb_cloned(skb)) {
>>>                   skb_trim(skb, 0);
>>>                   skb_get(skb);
>>>                   skb_reset_transport_header(skb);
>>>          } else {
>>> +               if (skb)
>>> +                       kfree (skb);
>>>                  skb = alloc_skb(len, gfp);
>>>          }
>>>          t4_set_arp_err_handler(skb, NULL, NULL);
>>>
>> Isn't kfree(NULL) legal?
>>
>> (i.e. the if statement is useless)
>>
>> Thanks,
>>      Levente Kurusa