linux-kernel - Re: [patch] IB/cma: allocating too much memory in make_cma

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Message-ID: <569EA3A3.5080105@redhat.com>
Date:	Tue, 19 Jan 2016 15:59:15 -0500
From:	Doug Ledford <dledford@...hat.com>
To:	Matan Barak <matanb@....mellanox.co.il>,
	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Matan Barak <matanb@...lanox.com>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] IB/cma: allocating too much memory in make_cma_ports()

On 01/12/2016 08:08 AM, Matan Barak wrote:
> On Tue, Jan 12, 2016 at 11:29 AM, Dan Carpenter
> <dan.carpenter@...cle.com> wrote:
>> The issue here is that there is a cut and paste bug.  When we allocate
>> cma_dev_group->default_ports_group we use "sizeof(*cma_dev_group->ports)"
>> instead of "sizeof(*cma_dev_group->default_ports_group)".
>>
>> We're bumping up against the 80 character limit so I introduced a new
>> local pointer "ports_group" to get around that.
>>
>> Fixes: 045959db65c6 ('IB/cma: Add configfs for rdma_cm')
>> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>> ---
>> Not tested.
>>
>> diff --git a/drivers/infiniband/core/cma_configfs.c b/drivers/infiniband/core/cma_configfs.c
>> index bd1d640..18b112a 100644
>> --- a/drivers/infiniband/core/cma_configfs.c
>> +++ b/drivers/infiniband/core/cma_configfs.c
>> @@ -158,6 +158,7 @@ static int make_cma_ports(struct cma_dev_group *cma_dev_group,
>>         unsigned int i;
>>         unsigned int ports_num;
>>         struct cma_dev_port_group *ports;
>> +       struct config_group **ports_group;
>>         int err;
>>
>>         ibdev = cma_get_ib_dev(cma_dev);
>> @@ -168,12 +169,9 @@ static int make_cma_ports(struct cma_dev_group *cma_dev_group,
>>         ports_num = ibdev->phys_port_cnt;
>>         ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
>>                         GFP_KERNEL);
>> +       ports_group = kcalloc(ports_num + 1, sizeof(*ports_group), GFP_KERNEL);
>>
>> -       cma_dev_group->default_ports_group = kcalloc(ports_num + 1,
>> -                                                    sizeof(*cma_dev_group->ports),
>> -                                                    GFP_KERNEL);
>> -
>> -       if (!ports || !cma_dev_group->default_ports_group) {
>> +       if (!ports || !ports_group) {
>>                 err = -ENOMEM;
>>                 goto free;
>>         }
>> @@ -187,15 +185,16 @@ static int make_cma_ports(struct cma_dev_group *cma_dev_group,
>>                 config_group_init_type_name(&ports[i].group,
>>                                             port_str,
>>                                             &cma_port_group_type);
>> -               cma_dev_group->default_ports_group[i] = &ports[i].group;
>> +               ports_group[i] = &ports[i].group;
>>         }
>> -       cma_dev_group->default_ports_group[i] = NULL;
>> +       ports_group[i] = NULL;
>> +       cma_dev_group->default_ports_group = ports_group;
>>         cma_dev_group->ports = ports;
>>
>>         return 0;
>>  free:
>>         kfree(ports);
>> -       kfree(cma_dev_group->default_ports_group);
>> +       kfree(ports_group);
>>         cma_dev_group->ports = NULL;
>>         cma_dev_group->default_ports_group = NULL;
>>         return err;
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> Hi,
> 
> This is already fixed in [1].
> Anyway, I'm fine with either one of them.
> 
> Acked-by: Matan Barak <matanb@...lanox.com>
> 
> Regards,
> Matan
> 
> [1] http://www.spinics.net/lists/linux-rdma/msg32152.html
> 

Thanks, applied.

-- 
Doug Ledford <dledford@...hat.com>
              GPG KeyID: 0E572FDD



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