[net,v2,1/9] macsec: add missing NULL check after kmalloc

Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
---
 drivers/net/macsec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

On 22.04.2016 11:28, Sabrina Dubroca wrote:
> Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
> ---
>   drivers/net/macsec.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
> index 84d3e5ca8817..f691030ee3df 100644
> --- a/drivers/net/macsec.c
> +++ b/drivers/net/macsec.c
> @@ -1622,8 +1622,8 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
>   	}
>
>   	rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
> -	if (init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len,
> -		       secy->icv_len)) {
> +	if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
> +				 secy->key_len, secy->icv_len)) {
>   		rtnl_unlock();
>   		return -ENOMEM;
>   	}


In case that kmalloc was successful and init_rx_sa failed, the allocated memory should be freed, shouldnt it?.

Regards,
Lino

2016-04-22, 11:35:03 +0200, Lino Sanfilippo wrote:
> 
> 
> On 22.04.2016 11:28, Sabrina Dubroca wrote:
> > Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
> > Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> > Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
> > Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
> > ---
> >   drivers/net/macsec.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
> > index 84d3e5ca8817..f691030ee3df 100644
> > --- a/drivers/net/macsec.c
> > +++ b/drivers/net/macsec.c
> > @@ -1622,8 +1622,8 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
> >   	}
> > 
> >   	rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
> > -	if (init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len,
> > -		       secy->icv_len)) {
> > +	if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
> > +				 secy->key_len, secy->icv_len)) {
> >   		rtnl_unlock();
> >   		return -ENOMEM;
> >   	}
> 
> 
> In case that kmalloc was successful and init_rx_sa failed, the allocated memory should be freed, shouldnt it?.

Yep, Lance pointed that out in v1:
http://marc.info/?l=linux-netdev&m=146108796406155

But since we have the same code with init_tx_sa, I decided to fix both
in a separate patch (7/9 in this set).


Thanks,

On 22.04.2016 11:48, Sabrina Dubroca wrote:
> 2016-04-22, 11:35:03 +0200, Lino Sanfilippo wrote:
>>
>>
>> On 22.04.2016 11:28, Sabrina Dubroca wrote:
>>> Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
>>> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>>> Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
>>> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
>>> ---
>>>    drivers/net/macsec.c | 4 ++--
>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
>>> index 84d3e5ca8817..f691030ee3df 100644
>>> --- a/drivers/net/macsec.c
>>> +++ b/drivers/net/macsec.c
>>> @@ -1622,8 +1622,8 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
>>>    	}
>>>
>>>    	rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
>>> -	if (init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len,
>>> -		       secy->icv_len)) {
>>> +	if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
>>> +				 secy->key_len, secy->icv_len)) {
>>>    		rtnl_unlock();
>>>    		return -ENOMEM;
>>>    	}
>>
>>
>> In case that kmalloc was successful and init_rx_sa failed, the allocated memory should be freed, shouldnt it?.
>
> Yep, Lance pointed that out in v1:
> http://marc.info/?l=linux-netdev&m=146108796406155
>
> But since we have the same code with init_tx_sa, I decided to fix both
> in a separate patch (7/9 in this set).
>

Ah ok, sorry about the noise then :)

Regards,
Lino