2013/11/17 James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>:
> On Sun, 2013-11-17 at 19:09 -0200, Geyslan Gregório Bem wrote:
>> 2013/11/17 James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>:
>> > On Sun, 2013-11-17 at 15:51 -0300, Geyslan G. Bem wrote:
>> >> This patch fix memory leakage in cases 'ISCSI_NET_PARAM_VLAN_ID' and
>> >> 'ISCSI_NET_PARAM_VLAN_PRIORITY' and refactors code 'going out' when
>> >> necessary.
>> >
>> > You pointlessly renamed a variable, which makes the diff hard to read.
>> > Please don't do that.
>>
>> Ok, I can agree. 'len' means length? What is returned in case of non
>> error?
>
> it returns the length of buf written to or negative error.
>
>> > You missed the fact that the passed in pointer is unmodified if
>> > mgmt_get_if_info() returns non zero, so the kfree frees junk and would
>> > oops.
>> >
>> > There's no need for a goto; len = -EINVAL; does everything that's
>> > needed.
>>
>> Well, that is a coverity catch. CID 1128954. Check it.
>
> I didn't say coverity was wrong, I said your patch was (well not wrong,
> just over complex and incomplete). This is the way to fix both
> problems.
>
> James
>
> ---
>
> diff --git a/drivers/scsi/be2iscsi/be_iscsi.c b/drivers/scsi/be2iscsi/be_iscsi.c
> index ffadbee..9dcbdfa 100644
> --- a/drivers/scsi/be2iscsi/be_iscsi.c
> +++ b/drivers/scsi/be2iscsi/be_iscsi.c
> @@ -541,10 +541,8 @@ static int be2iscsi_get_if_param(struct beiscsi_hba *phba,
> ip_type = BE2_IPV6;
James, this approach will not prevent the leakage. We can initialize
the if_info with NULL and always kfree it without to care about junk.
>
> len = mgmt_get_if_info(phba, ip_type, &if_info);
> - if (len) {
> - kfree(if_info);
> + if (len)
> return len;
> - }
>
> switch (param) {
> case ISCSI_NET_PARAM_IPV4_ADDR:
> @@ -569,7 +567,7 @@ static int be2iscsi_get_if_param(struct beiscsi_hba *phba,
> break;
> case ISCSI_NET_PARAM_VLAN_ID:
> if (if_info->vlan_priority == BEISCSI_VLAN_DISABLE)
> - return -EINVAL;
> + len = -EINVAL;
> else
> len = sprintf(buf, "%d\n",
> (if_info->vlan_priority &
>
>
--
Regards,
Geyslan G. Bem
hackingbits.com
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